Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

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Document and Entity Information - shares
 3 Months Ended
Jun. 30, 2015
Jul. 21, 2015
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description On November 6, 2015, we filed an amended Annual Report on Form 10-K for the fiscal year ended March 31, 2015. This Amendment No. 1 on Form 10-Q/A ("Amendment No. 1") amends the Quarterly Report on Form 10-Q of Westell Technologies, Inc. (the “Company”) for the fiscal quarter ended June 30, 2015, as originally filed with the Securities and Exchange Commission (the “SEC”) on July 31, 2015 (the “Original Filing”). Amendment No. 1 amends the Original Filing to correct an error related to a previously unidentified pre-acquisition liability, as more fully described in Note 1 to the Condensed Consolidated Financial Statements contained in this Amendment No. 1. For ease of reference, Amendment No. 1 amends and restates the Original Filing in its entirety.  
Document Period End Date Jun. 30, 2015  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Entity Registrant Name WESTELL TECHNOLOGIES INC  
Entity Central Index Key 0001002135  
Current Fiscal Year End Date --03-31  
Entity Filer Category Accelerated Filer  
Class A Common Stock    
Entity Common Stock, Shares Outstanding   46,965,244
Class B Common Stock    
Entity Common Stock, Shares Outstanding   13,937,151