Share-Based Compensation Share-Based Compensation (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Item]
Remaining shares available for grant		2,797,136
Weighted-average assumptions used for options granted:
Risk-free interest rate		2.44%	1.16%
Expected life of options		5 years 10 months 24 days	5 years 10 months 24 days
Exptected dividend yield of stock		0.80%	0.97%
Expected volatility of stock		24.49%	24.37%
Estimated forfeiture rate		2.54%	2.85%
Summary of share option activity:
Outstanding at March 31, 2017		1,560,954
Granted		235,435
Exercised		(24,408)
Forfeited		(8,928)
Outstanding at June 30, 2017		1,763,053
Exercisable at June 30, 2017		1,118,754
Weighted average exercise price:
Outstanding at March 31, 2017 | $ / shares		$ 138.37
Granted | $ / shares		247.45
Exercised | $ / shares		50.99
Forfeited | $ / shares		205.25
Outstanding at June 30, 2017 | $ / shares		153.81
Exercisable at June 30, 2017 | $ / shares		$ 119.95
Average Remaining Contractual Term, Outstanding at June 30, 2017		6 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding at June 30, 2017 | $		$ 58,929
Average Remaining Contractual Term, Exercisable at June 30, 2017		5 years 7 months 6 days
Aggregate Intrinsic Value, Exercisable at June 30, 2017 | $		$ 57,462
Non-vested stock options outstanding expected to vest		626,912
Ordinary shares, closing price | $ / shares		$ 166.28
Total intrinsic value of stock options exercised | $		$ 4,553	$ 16,076
Net cash proceeds from the exercise of stock options | $		$ 1,458	$ 7,829
Weighted average grant date fair value of stock option grants, per share | $ / shares		$ 50.72	$ 37.34
Summary of non-vested restricted share activity:
Unrecognized compensation cost related to nonvested share-based compensation granted | $		$ 80,182
Weighted Average Period For Total Compensation Expense Not Yet Recognized		2 years 3 months 18 days
Restricted Stock
Summary of non-vested restricted share activity:
Number of Restricted Shares, Non-vested at Beginning of Period		485,510
Weighted-Average Grant Date Fair Value, Non-vested at Beginning of Period | $ / shares		$ 157.37
Number of Restricted Shares, Granted		124,558
Weighted-Average Grant Date Fair Value, Granted | $ / shares		$ 226.03
Number of Restricted Shares, Vested		(138,099)
Weighted-Average Grant Date Fair Value, Vested | $ / shares		$ 125.48
Number of Restricted Shares, Canceled		(12,750)
Weighted-Average Grant Date Fair Value, Canceled | $ / shares		$ 179.57
Number of Restricted Shares, Non-vested at End of Period		459,219
Weighted-Average Grant Date Fair Value, Non-vested at End of Period | $ / shares		$ 185.84
Fair Value, Share-based Payment Awards, Other than Options | $		$ 18,989
Restricted Stock Units (RSUs)
Weighted average exercise price:
Weighted average grant date fair value of stock option grants, per share | $ / shares	$ 191.18
Summary of non-vested restricted share activity:
Number of Restricted Shares, Non-vested at Beginning of Period		33,677
Number of Restricted Shares, Granted		13,030
Number of Restricted Shares, Vested		(13,101)
Number of Restricted Shares, Canceled		(1,246)
Number of Restricted Shares, Non-vested at End of Period		32,360
Share-based Payment Arrangement, Expense | $	$ 18,545
Share-based Compensation Arrangement by Share-based Payment Award, Conversion Ratio	0.4262
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value Attributable to Pre-Acquisition Services | $	$ 18,173
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value | $	$ 53,607
RSUs Cantel
Summary of non-vested restricted share activity:
Number of Restricted Shares, Non-vested at Beginning of Period		45,722
Weighted-Average Grant Date Fair Value, Non-vested at Beginning of Period | $ / shares		$ 191.18
Number of Restricted Shares, Granted		0
Weighted-Average Grant Date Fair Value, Granted | $ / shares		$ 0
Number of Restricted Shares, Vested		(2,729)
Weighted-Average Grant Date Fair Value, Vested | $ / shares		$ 191.18
Number of Restricted Shares, Canceled		(3,738)
Weighted-Average Grant Date Fair Value, Canceled | $ / shares		$ 191.18
Number of Restricted Shares, Non-vested at End of Period	280,402	39,255
Weighted-Average Grant Date Fair Value, Non-vested at End of Period | $ / shares		$ 191.18
Unrecognized compensation cost related to nonvested share-based compensation granted | $		$ 3,178
Weighted Average Period For Total Compensation Expense Not Yet Recognized		1 year