Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details 2)

v2.4.1.9
Acquisitions (Details 2) (CSI [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Dec. 31, 2014
Mar. 02, 2014
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 16,173us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Order or Production Backlog [Member]
    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   90us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
/ dei_LegalEntityAxis
= wstl_CSIMember
Finite-Lived Intangible Asset, Useful Life 0 years 1 month  
Customer Relationships [Member]
    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   11,410us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
/ dei_LegalEntityAxis
= wstl_CSIMember
Finite-Lived Intangible Asset, Useful Life 9 years  
Trademarks [Member]
    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   303us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ dei_LegalEntityAxis
= wstl_CSIMember
Finite-Lived Intangible Asset, Useful Life 1 year  
Technology [Member]
    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   3,860us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= wstl_TechnologyMember
/ dei_LegalEntityAxis
= wstl_CSIMember
Finite-Lived Intangible Asset, Useful Life 3 years  
Noncompete [Member]
    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 510us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= wstl_NoncompeteMember
/ dei_LegalEntityAxis
= wstl_CSIMember
Finite-Lived Intangible Asset, Useful Life 2 years