Annual report pursuant to Section 13 and 15(d)

Product Warranties (Details Textual)

v2.4.1.9
Product Warranties (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Product Warranties (Textual) [Abstract]      
Current portions of warranty reserve   383us-gaap_StandardProductWarrantyAccrualCurrent $ 286us-gaap_StandardProductWarrantyAccrualCurrent
Long-term portions of the warranty reserve   122us-gaap_StandardProductWarrantyAccrualNoncurrent 42us-gaap_StandardProductWarrantyAccrualNoncurrent
Specific pre-acquisition ANTONE product warranty in excess of acquired limit $ 303wstl_SpecificPreAcquisitionProductWarrantyAccrualAdditions    
CSG [Member] | Maximum [Member]      
Product Liability Contingency [Line Items]      
Standard Product Warranty Description   P7Y  
CSG [Member] | Minimum [Member]      
Product Liability Contingency [Line Items]      
Standard Product Warranty Description   P1Y  
IBW [Member] | Maximum [Member]      
Product Liability Contingency [Line Items]      
Standard Product Warranty Description   P5Y  
IBW [Member] | Minimum [Member]      
Product Liability Contingency [Line Items]      
Standard Product Warranty Description   P1Y