v3.8.0.1
Document and Entity Information Document - shares
9 Months Ended
Dec. 31, 2017
Feb. 02, 2018
Entity Information [Line Items]    
Entity Registrant Name STERIS plc  
Entity Central Index Key 0001624899  
Document Type 10-Q  
Document Period End Date Dec. 31, 2017  
Amendment Flag false  
Document Fiscal Year Focus 2018  
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   84,848,063