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Repurchases of Common Shares	12 Months Ended
Repurchases of Common Shares	Mar. 31, 2019
Repurchases of Common Shares [Abstract]
Schedule of Treasury Stock by Class [Text Block]	On August 9, 2016, STERIS UK announced that its Board of Directors had authorized the purchase of up to $300 million (net of taxes, fees and commissions) of our ordinary shares. We repurchased 651,093 of our ordinary shares during fiscal 2019 for the amount of $72,082, excluding taxes, fees and commissions. We repurchased 664,963 of our ordinary shares during fiscal 2018 for the amount of $58,939, excluding taxes, fees and commissions. As a result of the Redomiciliation that share repurchase authorization terminated. On May 7, 2019, our Board of Directors authorized the continuation of the share repurchase program by STERIS Ireland. There is approximately $80,000 (net of taxes, fees and commissions) of remaining availability under the authorization. Under the authorization, the Company may repurchase its shares from time to time through open market purchases, including 10b5-1 plans. The repurchase program may be suspended or discontinued at any time. We obtained 112,356 of our shares during fiscal 2019 in the aggregate amount of $8,262 in connection with stock based compensation award programs. We obtained 127,903 of our shares during fiscal 2018 in the aggregate amount of $7,014 in connection with these programs. We obtained 168,906 of our shares during fiscal 2017 in the aggregate amount of $7,034 in connection with these programs.