Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details 1)

v2.4.1.9
Acquisitions Acquisitions (Details 1) (CSI [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 02, 2014
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 16,173us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Backlog [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   90us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OrderOrProductionBacklogMember
Finite-Lived Intangible Asset, Useful Life 0 years 1 month  
Customer Relationships [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   11,410us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Asset, Useful Life 9 years  
Trademarks [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   303us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Finite-Lived Intangible Asset, Useful Life 1 year  
Product Technology [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   3,860us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TechnologyBasedIntangibleAssetsMember
Finite-Lived Intangible Asset, Useful Life 3 years  
Noncompete Agreements [Member]
   
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 510us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= wstl_CSIMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Finite-Lived Intangible Asset, Useful Life 2 years