Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details Textual)

v2.4.1.9
Basis of Presentation (Details Textual) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Apr. 02, 2013
Mar. 02, 2014
Business Acquisition [Line Items]            
Cost of revenue $ 9,648,000us-gaap_CostOfGoodsAndServicesSold $ 13,304,000us-gaap_CostOfGoodsAndServicesSold [1] $ 43,370,000us-gaap_CostOfGoodsAndServicesSold $ 45,281,000us-gaap_CostOfGoodsAndServicesSold [1]    
CostofRevenueAdjustmentUsingPreviousAccountingGuidance 168,000wstl_CostofRevenueAdjustmentUsingPreviousAccountingGuidance   668,000wstl_CostofRevenueAdjustmentUsingPreviousAccountingGuidance      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome 0us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome    
Kentrox [Member]            
Business Acquisition [Line Items]            
Equity Method Investment, Ownership Percentage         100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= wstl_KentroxMember 		 
CSI [Member]            
Business Acquisition [Line Items]            
Equity Method Investment, Ownership Percentage           100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= wstl_CSIMember
Restatement Adjustment [Member]            
Business Acquisition [Line Items]            
Cost of revenue   $ 303,000us-gaap_CostOfGoodsAndServicesSold
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		  $ 1,063,000us-gaap_CostOfGoodsAndServicesSold
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember 		   
[1] Certain amounts have been reclassified to reflect a change in accounting principle. See Note 1.