v3.8.0.1
Document and Entity Information Document - shares
6 Months Ended
Sep. 30, 2017
Nov. 03, 2017
Entity Information [Line Items]    
Entity Registrant Name STERIS plc  
Entity Central Index Key 0001624899  
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   85,052,363