Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Details)

v2.4.1.9
Subsequent Event (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Subsequent Event [Line Items]          
Restructuring $ 0us-gaap_RestructuringCharges $ 38us-gaap_RestructuringCharges $ 55us-gaap_RestructuringCharges $ 273us-gaap_RestructuringCharges  
4Q15 Restructuring [Member]          
Subsequent Event [Line Items]          
Restructuring         $ 3,000us-gaap_RestructuringCharges
/ us-gaap_SubsequentEventTypeAxis
= wstl_A4Q15RestructuringMember