v3.10.0.1
Document and Entity Information Document - shares
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Feb. 08, 2019
Entity Information [Line Items]      
Entity Registrant Name   STERIS plc  
Entity Central Index Key   0001624899  
Document Type   10-Q  
Document Period End Date   Dec. 31, 2018  
Amendment Flag   false  
Document Fiscal Year Focus   2019  
Document Fiscal Period Focus Q3    
Current Fiscal Year End Date   --03-31  
Entity Current Reporting Status   Yes  
Entity Small Business   false  
Entity Emerging Growth Company   false  
Entity Filer Category   Large Accelerated Filer  
Entity Common Stock, Shares Outstanding     84,587,442