v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Mar. 31, 2015
May 22, 2015
Sep. 30, 2014
DEI [Abstract]      
Entity Registrant Name STERIS CORP    
Entity Central Index Key 0000815065    
Document Type 10-K    
Document Period End Date Mar. 31, 2015    
Amendment Flag false    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --03-31    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   59,724,004  
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 3,117,279,156
Entity Voluntary Filers No