Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
May 14, 2013
Class A Common Stock [Member]
May 14, 2013
Class B Common Stock [Member]
Entity Registrant Name WESTELL TECHNOLOGIES INC      
Entity Central Index Key 0001002135      
Current Fiscal Year End Date --03-31      
Entity Filer Category Accelerated Filer      
Document Type 10-K      
Document Period End Date Mar. 31, 2013      
Document Fiscal Year Focus 2013      
Document Fiscal Period Focus Q4      
Amendment Flag false      
Entity Common Stock, Shares Outstanding     45,073,067 13,937,151
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes      
Entity Public Float   $ 82