Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

v3.8.0.1
Document and Entity Information - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2018
May 14, 2018
Sep. 30, 2017
Entity Registrant Name WESTELL TECHNOLOGIES INC    
Entity Central Index Key 0001002135    
Current Fiscal Year End Date --03-31    
Entity Filer Category Smaller Reporting Company    
Document Type 10-K    
Document Period End Date Mar. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 26
Class A Common Stock [Member]      
Entity Common Stock, Shares Outstanding   12,243,927  
Class B Common Stock [Member]      
Entity Common Stock, Shares Outstanding   3,484,287