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, 2012
Sep. 30, 2011
May 14, 2012
Class A Common Stock
May 14, 2012
Class B Common Stock
Document Type 10-K      
Amendment Flag false      
Document Period End Date Mar. 31, 2012      
Document Fiscal Period Focus FY      
Entity Central Index Key 0001002135      
Entity Registrant Name WESTELL TECHNOLOGIES INC      
Current Fiscal Year End Date --03-31      
Document Fiscal Year Focus 2012      
Entity Filer Category Accelerated Filer      
Trading Symbol WSTL      
Entity Common Stock, Shares Outstanding     49,432,494 13,937,151
Entity Public Float   $ 100    
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Current Reporting Status Yes