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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 18, 2019 | Oct. 03, 2018 | Oct. 10, 2003 | Oct. 31, 2019 | May 31, 2020 | May 31, 2019 | May 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding |  |  |  |  | $ 61.8 |  |
Weighted-average remaining contractual life of options outstanding |  |  |  |  | 6 years 1 month 9 days |  |
Aggregate intrinsic value of options exercisable |  |  |  |  | $ 46.6 |  |
Weighted-average remaining contractual life of options exercisable |  |  |  |  | 4 years 10 months 6 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 |  |  |  |  | $ 3.5 |  |
Shares of common stock authorized |  |  |  |  | 6,000,000 |  |
Additional shares of common stock authorized |  |  |  | 5,000,000 |  |  |
Shares of common stock available for grant |  |  |  | 6,100,427 |  |  |
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 |  |  |  |  | $ 1.9 |  |
Shares of common stock available for grant |  |  | 500,000 |  | 7,200 |  |
Shares granted to Directors |  |  |  |  | $ 67.26 | $ 60.50 | $ 51.63
Shares granted |  |  |  |  | 23,000 |  |
Shares of restricted stock vested |  |  |  |  | 16,000 |  |
2007 Plan and 2014 Omnibus Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares granted to Directors |  |  |  |  | $ 62.17 | $ 60.01 | $ 55.19
Shares granted |  |  |  |  | 30,185 |  |
Shares outstanding |  |  |  |  | 446,000 | 432,000 |
Employee Incentive Plan 2007 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  | $ 0.6 |  |
Shares of common stock available for grant |  |  |  |  | 0 |  |
SARs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock appreciation rights expected term |  |  |  |  | 6 years 6 months | 6 years 6 months | 7 years
Unamortized stock-based compensation expense |  |  |  |  | $ 7.9 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  | 2 years 3 months 18 days |  |
Shares expected to vest |  |  |  |  | 2,500,000 |  |
Shares expected to vest, weighted-average exercise price |  |  |  |  | $ 49.86 |  |
Shares expected to vest, weighted-average remaining contractual term |  |  |  |  | 6 years 1 month 6 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 |  |  |  |  | 2,482,500 |  |
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 |  |  |  |  | $ 15.8 |  |
Shares granted to Directors |  |  |  |  | $ 63.52 | $ 60.36 | $ 52.26
Shares granted |  |  |  |  | 405,000 |  |
Shares of restricted stock vested |  |  |  |  | 361,000 |  |
2018 Contingent Performance Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  | $ 0.6 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  | 1 year |  |
Shares granted to Directors |  | $ 60.50 |  |  |  |  |
Shares granted |  | 192,000 |  |  |  |  |
Performance goals attainment period for PSUs awards |  | 3 years |  |  |  |  |
Shares outstanding |  |  |  |  | 168,000 |  |
2018 Contingent Performance Stock Units | Earnings Before Interest Taxes |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |
2018 Contingent Performance Stock Units | Earnings Before Interest Taxes Margin |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting percentage |  | 50.00% |  |  |  |  |
2018 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% |  |  |  |  |
2018 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% |  |  |  |  |
2019 Contingent Performance Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  | $ 3.3 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  | 2 years |  |
Shares granted to Directors | $ 62.17 |  |  |  |  |  |
Shares granted | 178,000 |  |  |  |  |  |
Performance goals attainment period for PSUs awards | 3 years |  |  |  |  |  |
Shares outstanding |  |  |  |  | 178,000 |  |
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% |  |  |  |  |  |
Nonvested Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  | $ 25.7 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  | 2 years 2 months 4 days |  |
Shares granted to Directors |  |  |  |  | $ 63.62 | $ 60.34 | $ 52.62
Shares granted |  |  |  |  | 458,000 |  |
Remaining weighted-average contractual term |  |  |  |  | 2 years 2 months 4 days |  |
Total fair value of shares vested |  |  |  |  | $ 20.8 | $ 37.8 | $ 29.9
Shares expected to vest |  |  |  |  | 1,120,000 |  |
Shares expected to vest, weighted-average grant-date fair value |  |  |  |  | $ 58.03 |  |
Shares of restricted stock vested |  |  |  |  | 421,000 |  |
Total intrinsic value of restricted shares converted |  |  |  |  | $ 26.8 | $ 58.1 | $ 7.6
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares of restricted stock vested |  |  |  |  | 420,571 | 832,717 |

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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=116856206&loc=d3e5070-113901 + Details
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