Document and Entity Information Document - shares	9 Months Ended
	Dec. 31, 2020	Feb. 05, 2021
Entity Information [Line Items]
Entity Registrant Name	STERIS plc
Entity Central Index Key	0001757898
Document Type	10-Q
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		85,352,713
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	001-38848
Entity Incorporation, State or Country Code	L2
Entity Tax Identification Number	98-1455064
Local Phone Number	1 232 2000
City Area Code	353
Document Transition Report	false
Document Quarterly Report	true
Entity Address, Address Line One	70 Sir John Rogerson's Quay,
Entity Address, City or Town	Dublin 2,
Entity Address, Country	IE
Entity Address, Postal Zip Code	D02 R296
Title of 12(b) Security	Ordinary Shares, $0.001 par value
Trading Symbol	STE
Security Exchange Name	NYSE
Entity Shell Company	false