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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 03, 2018 | Oct. 10, 2003 | Jul. 31, 2015 | May 31, 2019 | May 31, 2018 | May 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate intrinsic value of options outstanding |  |  |  | $ 25,900 |  |
Weighted-average remaining contractual life of options outstanding |  |  |  | 5 years 7 months 28 days |  |
Aggregate intrinsic value of options exercisable |  |  |  | $ 24,900 |  |
Weighted-average remaining contractual life of options exercisable |  |  |  | 4 years 4 months 24 days |  |
Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Incentive plan approval date |  |  |  | Oct. 09, 2014 |  |
2004 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of common stock authorized |  |  |  | 12,000,000 |  |
2014 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | $ 2,100 |  |
Shares of common stock authorized |  |  |  | 6,000,000 |  |
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 |  |  |  | $ 1,400 |  |
Shares granted to Directors |  |  |  | $ 60.50 | $ 51.63 | $ 50.61
Shares granted |  |  |  | 23,000 |  |
Shares of common stock available for grant |  | 500,000 |  | 30,300 |  |
Shares of restricted stock vested |  |  |  | 35,000 |  |
2007 Plan and 2014 Omnibus Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted to Directors |  |  |  | $ 60.01 | $ 55.19 | $ 50.99
Shares granted |  |  |  | 38,946 |  |
Shares outstanding |  |  |  | 432,000 | 702,000 |
Employee Incentive Plan 2007 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | $ 1,200 |  |
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 | 7 years | 7 years
Unamortized stock-based compensation expense |  |  |  | $ 8,600 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  | 2 years 6 months 7 days |  |
Shares expected to vest |  |  |  | 3,100,000 |  |
Shares expected to vest, weighted-average exercise price |  |  |  | $ 46.38 |  |
Shares expected to vest, weighted-average remaining contractual term |  |  |  | 5 years 7 months 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 |  |  |  | 3,097,500 |  |
Full Value Stock Award | 2004 Omnibus Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of common stock authorized |  |  |  | 6,000,000 |  |
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 |  |
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 |  |  |  | $ 11,700 |  |
Shares granted to Directors |  |  |  | $ 60.36 | $ 52.26 | $ 50.84
Shares granted |  |  |  | 440,000 |  |
Shares of restricted stock vested |  |  |  | 624,000 |  |
2015 Performance Contingent Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted to Directors |  |  | $ 46.87 |  |  |
Shares granted |  |  | 329,000 |  |  |
Performance goals attainment period for PCRS awards |  |  | 3 years |  |  |
Shares outstanding |  |  |  |  | 301,000 |
2015 Performance Contingent Restricted Stock | Earnings Before Interest Taxes |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 67.00% |  |  |
2015 Performance Contingent Restricted Stock | Earnings Before Interest Taxes Margin |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage |  |  | 33.00% |  |  |
2018 Contingent Performance Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | $ 5,600 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  | 2 years |  |
Shares granted to Directors | $ 60.50 |  |  |  |  |
Shares granted | 192,000 |  |  |  |  |
Performance goals attainment period for PCRS awards | 3 years |  |  |  |  |
Shares outstanding |  |  |  | 166,000 |  |
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% |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | $ 70 |  |
Nonvested Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | $ 24,700 |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  | 2 years 2 months 26 days |  |
Shares granted to Directors |  |  |  | $ 60.34 | $ 52.62 | $ 50.84
Shares granted |  |  |  | 503,000 |  |
Remaining weighted-average contractual term |  |  |  | 2 years 2 months 26 days |  |
Total fair value of shares vested |  |  |  | $ 37,800 | $ 29,900 | $ 20,300
Shares expected to vest |  |  |  | 1,090,000 |  |
Shares expected to vest, weighted-average grant-date fair value |  |  |  | $ 52.35 |  |
Shares of restricted stock vested |  |  |  | 833,000 |  |
Total intrinsic value of restricted shares converted |  |  |  | $ 58,100 | $ 7,600 | $ 9,000
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of restricted stock vested |  |  |  | 832,717 | 360,762 |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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