Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entity and Guarantee (Details)

v2.4.1.9
Variable Interest Entity and Guarantee (Details) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Apr. 02, 2013
Concentration Risk [Line Items]            
Revenue $ 14,043,000us-gaap_SalesRevenueNet $ 25,236,000us-gaap_SalesRevenueNet $ 65,514,000us-gaap_SalesRevenueNet $ 77,652,000us-gaap_SalesRevenueNet    
AKA [Member]            
Concentration Risk [Line Items]            
Equity Method Investments 74,000us-gaap_EquityMethodInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  74,000us-gaap_EquityMethodInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  84,000us-gaap_EquityMethodInvestments
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
 
Revenue 300,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
1,300,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
1,400,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
3,900,000us-gaap_SalesRevenueNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
   
Accounts Receivable, Net, Current 200,000us-gaap_AccountsReceivableNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  200,000us-gaap_AccountsReceivableNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  400,000us-gaap_AccountsReceivableNet
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
 
Deferred Revenue 1,100,000us-gaap_DeferredRevenue
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  1,100,000us-gaap_DeferredRevenue
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  1,000,000us-gaap_DeferredRevenue
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
 
Guarantor Obligations, Maximum Exposure, Undiscounted $ 700,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
  $ 700,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_ConcentrationRiskByTypeAxis
= wstl_AKAMember
     
AKA [Member]            
Concentration Risk [Line Items]            
Equity Method Investment, Ownership Percentage           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= wstl_AKAMember