Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details 4)

v2.4.1.9
Acquisitions Acquisitions (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
May 15, 2012
Business Acquisition [Line Items]        
Goodwill $ 0us-gaap_Goodwill $ 31,102us-gaap_Goodwill [1] $ 0us-gaap_Goodwill  
Other Payments to Acquire Businesses 304us-gaap_OtherPaymentsToAcquireBusinesses 66,170us-gaap_OtherPaymentsToAcquireBusinesses 2,524us-gaap_OtherPaymentsToAcquireBusinesses  
Antone Wireless Corporation [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory       326us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Escrow Deposit       3us-gaap_EscrowDeposit
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       3,230us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities       (612)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Goodwill       2,086us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest       5,033us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
Payments to Acquire Businesses, Net of Cash Acquired     2,524us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
 
Other Significant Noncash Transaction, Value of Consideration Given     3,038us-gaap_OtherSignificantNoncashTransactionValueOfConsiderationGiven1
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
 
Business Acquisition Working Capital Shortfall     (529)wstl_BusinessAcquisitionWorkingCapitalShortfall
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
 
Other Payments to Acquire Businesses     $ 5,033us-gaap_OtherPaymentsToAcquireBusinesses
/ us-gaap_BusinessAcquisitionAxis
= wstl_AntoneWirelessCorporationMember
 
[1] Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition (see Note 2).