Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details)

v2.4.1.9
Acquisitions Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 02, 2014
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent   $ (8,800)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent    
Goodwill 0us-gaap_Goodwill 31,102us-gaap_Goodwill [1] 0us-gaap_Goodwill  
CSI [Member]        
Business Acquisition [Line Items]        
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired       6,513wstl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Acquired Receivables, Fair Value       2,900us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       7,383us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets       135us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       771us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       16,173us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable       (2,912)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayable       (1,175)wstl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayable
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent       (6,293)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Goodwill       20,547us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest       44,042us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
Scenario, Previously Reported [Member] | CSI [Member]        
Business Acquisition [Line Items]        
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired       6,513wstl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Acquired Receivables, Fair Value       2,920us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       7,625us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets       158us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       816us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       16,230us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable       (2,875)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayable       (1,175)wstl_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIncomeTaxPayable
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent       (6,616)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Goodwill       20,142us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest       43,738us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember
Restatement Adjustment [Member] | CSI [Member]        
Business Acquisition [Line Items]        
Business Combination, Acquired Receivables, Fair Value       (20)us-gaap_BusinessCombinationAcquiredReceivablesFairValue
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       (242)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets       (23)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       (45)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       (57)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[3]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable       (37)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[2]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent       323us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[3]
Goodwill       405us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest       $ 304us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		[4]
[1] Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition (see Note 2).
[2] Other measurement period adjustments mostly related to inventory adjustments.
[3] Intangible asset fair value adjustment for trade name and related tax effect.
[4] Payment for final working capital adjustment.