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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	12 Months Ended
	Jul. 21, 2021	Jul. 22, 2020	Jul. 18, 2019	Oct. 10, 2003	Oct. 31, 2019	May 31, 2022	May 31, 2021	May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options outstanding						$ 57.4
Weighted-average remaining contractual life of options outstanding						5 years 10 months 13 days
Aggregate intrinsic value of options exercisable						$ 48.0
Weighted-average remaining contractual life of options exercisable						4 years 7 months 24 days
Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan approval date						Oct. 09, 2014
2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense						$ 4.3
Shares of common stock authorized						6,000,000
Additional shares of common stock authorized					5,000,000
Shares available for future issuance						0
Directors Equity Incentive Plan 2003
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive plan approval date				Oct. 10, 2003
Share based compensation arrangement vesting period				3 years
Unamortized stock-based compensation expense						$ 2.0
Shares granted to Directors						$ 81.53	$ 87.35	$ 67.26
Shares granted						18,000
Shares of common stock available for grant				500,000
Shares of restricted stock vested						18,000
2007 Plan and 2014 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to Directors						$ 86.93	$ 78.49	$ 62.17
Shares granted						23,869
Shares outstanding						386,000	418,000
Employee Incentive Plan 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense						$ 0.1
Shares granted						0
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights expected term						6 years	6 years 6 months	6 years 6 months
Unamortized stock-based compensation expense						$ 7.8
Unamortized stock-based compensation expense expected recognition period						2 years 6 months
Shares expected to vest						2,300,000
Shares expected to vest, weighted-average exercise price						$ 63.14
Shares expected to vest, weighted-average remaining contractual term						5 years 10 months 13 days
SARs \| Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights expected term						10 years
Share based compensation arrangement vesting period						4 years
Stock options outstanding						2,300,000
Full Value Stock Award \| 2014 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized						3,000,000
Additional shares of common stock authorized					2,250,000
Performance Earned Restricted Stock Awards and Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation arrangement vesting period						3 years
Unamortized stock-based compensation expense						$ 22.4
Shares granted to Directors						$ 86.88	$ 80.67	$ 63.52
Shares granted						432,000
Shares of restricted stock vested						313,000
2019 Contingent Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted to Directors			$ 62.17
Shares granted			178,000
Performance goals attainment period for PSUs awards			3 years
Shares outstanding						153,000
2019 Contingent Performance Stock Units \| Earnings Before Interest Taxes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2019 Contingent Performance Stock Units \| Earnings Before Interest Taxes Margin
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2019 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
2019 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			200.00%
2020 Contingent Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense						$ 7.9
Unamortized stock-based compensation expense expected recognition period						1 year
Shares granted to Directors		$ 78.49
Shares granted		225,500
Performance goals attainment period for PSUs awards		3 years
Shares outstanding						196,250
2020 Contingent Performance Stock Units \| Earnings Before Interest Taxes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
2020 Contingent Performance Stock Units \| Earnings Before Interest Taxes Margin
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
2020 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		0.00%
2020 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		200.00%
2021 Contingent Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense						$ 8.8
Unamortized stock-based compensation expense expected recognition period						2 years
Shares granted to Directors	$ 86.93
Shares granted	157,700
Performance goals attainment period for PSUs awards	3 years
Shares outstanding						147,900
2021 Contingent Performance Stock Units \| Earnings Before Interest Taxes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
2021 Contingent Performance Stock Units \| Earnings Before Interest Taxes Margin
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
2021 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
2021 Contingent Performance Stock Units \| Upon Achievement of Performance Goals \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
Nonvested Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unamortized stock-based compensation expense						$ 45.5
Unamortized stock-based compensation expense expected recognition period						2 years 1 month 2 days
Shares granted to Directors						$ 86.68	$ 80.77	$ 63.62
Shares granted						474,000
Remaining weighted-average contractual term						2 years 1 month 2 days
Total fair value of shares vested						$ 27.2	$ 12.5	$ 20.8
Shares expected to vest						1,300,000
Shares expected to vest, weighted-average grant-date fair value						$ 76.38
Shares of restricted stock vested						441,000
Total intrinsic value of restricted shares converted						$ 33.0	$ 20.7	$ 26.8
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of restricted stock vested						441,594	250,329