v3.19.3.a.u2
Document and Entity Information Document - shares
9 Months Ended
Dec. 31, 2019
Feb. 05, 2020
Entity Information [Line Items]    
Document Transition Report false  
Title of 12(b) Security Ordinary Shares, $0.001 par value  
Entity Incorporation, State or Country Code L2  
Document Quarterly Report true  
Entity Registrant Name STERIS plc  
Local Phone Number 232 2000  
Entity Central Index Key 0001757898  
Document Type 10-Q  
Entity File Number 001-38848  
Document Period End Date Dec. 31, 2019  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --03-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   84,813,121
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Tax Identification Number 98-1455064  
Entity Address, Address Line One 70 Sir John Rogerson's Quay,  
Entity Address, City or Town Dublin 2,  
Country Region 353  
City Area Code 1  
Entity Address, State or Province IE  
Entity Address, Postal Zip Code D02 R296  
Trading Symbol STE  
Security Exchange Name NYSE  
Entity Interactive Data Current Yes  
Entity Shell Company false