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Share-Based Compensation Share-Based Compensation (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Item] |  |  |
Remaining shares available for grant | 3,257,138 | 3,257,138 |
Weighted-average assumptions used for options granted: |  |  |
Risk-free interest rate |  | 1.16% | 0.46%
Expected life of options |  | 5 years 10 months 24 days | 6 years
Exptected dividend yield of stock |  | 0.97% | 0.96%
Expected volatility of stock |  | 24.37% | 23.04%
Estimated forfeiture rate |  | 2.85% | 2.78%
Summary of share option activity: |  |  |
Outstanding at March 31, 2017 |  | 1,637,047 |
Granted |  | 214,734 |
Exercised |  | (112,199) |
Forfeited |  | 0 |
Outstanding at June 30, 2017 | 1,739,582 | 1,739,582 |
Exercisable at June 30, 2017 | 1,094,684 | 1,094,684 |
Weighted average exercise price: |  |  |
Outstanding at March 31, 2017 |  | $ 112.03 |
Granted |  | 210.79 |
Exercised |  | 68.78 |
Forfeited |  | 0 |
Outstanding at June 30, 2017 | $ 127.01 | 127.01 |
Exercisable at June 30, 2017 | $ 99.58 | $ 99.58 |
Average Remaining Contractual Term, Outstanding at June 30, 2017 |  | 6 years 8 months 12 days |
Aggregate Intrinsic Value, Outstanding at June 30, 2017 | $ 135,815,000 | $ 135,815,000 |
Average Remaining Contractual Term, Exercisable at June 30, 2017 |  | 5 years 8 months 12 days |
Aggregate Intrinsic Value, Exercisable at June 30, 2017 | $ 114,798,000 | $ 114,798,000 |
Non-vested stock options outstanding expected to vest | 626,598 | 626,598 |
Ordinary shares, closing price | $ 204.28 | $ 204.28 |
Total intrinsic value of stock options exercised |  | $ 16,076,000 | $ 25,244,000
Net cash proceeds from the exercise of stock options |  | $ 7,829,000 | $ 20,600,000
Weighted average grant date fair value of stock option grants, per share |  | $ 37.34 | $ 27.66
Summary of non-vested restricted share activity: |  |  |
Unrecognized compensation cost related to nonvested share-based compensation granted | $ 61,084,000 | $ 61,084,000 |
Weighted Average Period For Total Compensation Expense Not Yet Recognized |  | 2 years 2 months 12 days |
Stock Appreciation Rights (SARs) [Member] |  |  |
Weighted average exercise price: |  |  |
FairValueOfOutstandingStockAppreciationRights |  |  | $ 448,000
Restricted Stock |  |  |
Summary of non-vested restricted share activity: |  |  |
Number of Restricted Shares, Non-vested at Beginning of Period |  | 533,323 |
Weighted-Average Grant Date Fair Value, Non-vested at Beginning of Period |  | $ 121.35 |
Number of Restricted Shares, Granted |  | 112,036 |
Weighted-Average Grant Date Fair Value, Granted |  | $ 192.85 |
Number of Restricted Shares, Vested |  | (170,619) |
Weighted-Average Grant Date Fair Value, Vested |  | $ 96.19 |
Number of Restricted Shares, Canceled |  | (8,425) |
Weighted-Average Grant Date Fair Value, Canceled |  | $ 153.97 |
Number of Restricted Shares, Non-vested at End of Period | 466,315 | 466,315 |
Weighted-Average Grant Date Fair Value, Non-vested at End of Period | $ 148.57 | $ 148.57 |
Fair Value, Share-based Payment Awards, Other than Options |  | $ 17,865,000 |
Restricted Stock Units (RSUs) |  |  |
Weighted average exercise price: |  |  |
Weighted average grant date fair value of stock option grants, per share | $ 191.18 |  |
Summary of non-vested restricted share activity: |  |  |
Number of Restricted Shares, Non-vested at Beginning of Period |  | 29,500 |
Number of Restricted Shares, Granted |  | 14,189 |
Number of Restricted Shares, Vested |  | (15,534) |
Number of Restricted Shares, Canceled |  | (430) |
Number of Restricted Shares, Non-vested at End of Period | 27,725 | 27,725 |
Share-based Payment Arrangement, Expense |  | $ 17,985,000 |
Restricted Stock or Unit Expense |  | $ 280,402 |
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 | $ 18,173,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value | $ 53,607,000 |  |
RSUs Cantel |  |  |
Summary of non-vested restricted share activity: |  |  |
Number of Restricted Shares, Non-vested at Beginning of Period |  | 0 |
Weighted-Average Grant Date Fair Value, Non-vested at Beginning of Period |  | $ 0 |
Number of Restricted Shares, Granted |  | 280,402 |
Weighted-Average Grant Date Fair Value, Granted |  | $ 191.18 |
Number of Restricted Shares, Vested |  | (157,821) |
Weighted-Average Grant Date Fair Value, Vested |  | $ 191.18 |
Number of Restricted Shares, Canceled |  | (3,380) |
Weighted-Average Grant Date Fair Value, Canceled |  | $ 191.18 |
Number of Restricted Shares, Non-vested at End of Period | 119,201 | 119,201 |
Weighted-Average Grant Date Fair Value, Non-vested at End of Period | $ 191.18 | $ 191.18 |
Unrecognized compensation cost related to nonvested share-based compensation granted | $ 12,521,000 | $ 12,521,000 |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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