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Stock-Based Compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May. 31, 2014 | Oct. 10, 2003 | Jul. 31, 2012 | Jun. 30, 2012 | Jul. 31, 2011 | Oct. 31, 2010 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013 | May. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock appreciation rights expected term |  |  |  |  |  |  | 7 years 6 months | 7 years 6 months | 7 years 6 months |
Stock options outstanding |  |  |  |  |  |  | 0 |  |  |
Aggregate intrinsic value of options outstanding |  |  |  |  |  |  | $ 81,100,000 |  |  |
Weighted-average remaining contractual life of options outstanding |  |  |  |  |  |  | 6 years |  |  |
Aggregate intrinsic value of options exercisable |  |  |  |  |  |  | $ 59,300,000 |  |  |
Weighted-average remaining contractual life of options exercisable |  |  |  |  |  |  | 4 years 8 months 12 days |  |  |
Shares expected to vest |  |  |  |  |  |  | 2,600,000 |  |  |
Remaining weighted-average contractual term |  |  |  |  |  |  | 3 years 1 month 6 days |  |  |
Total fair value of shares vested |  |  |  |  |  |  | $ 14,700,000 | $ 12,800,000 | $ 3,300,000 |
Shares expected to vest, weighted-average grant-date fair value |  |  |  |  |  |  | $ 28.75 |  |  |
Total intrinsic value of restricted shares converted | $ 10,400,000 |  |  |  |  |  | $ 13,900,000 | $ 10,400,000 | $ 1,300,000 |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 3,529,500 |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 7,400,000 |  |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  |  |  | 3 years 3 months |  |  |
Shares expected to vest |  |  |  |  |  |  | 1,400,000 |  |  |
Shares expected to vest, weighted-average exercise price |  |  |  |  |  |  | $ 34.65 |  |  |
Shares expected to vest, weighted-average remaining contractual term |  |  |  |  |  |  | 8 years |  |  |
Performance Based Restricted Stock Awards |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement vesting period |  |  |  |  |  |  | 3 years |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 22,600,000 |  |  |
Shares granted to Directors |  |  |  |  |  |  | $ 44.28 | $ 35.11 | $ 26.22 |
Shares granted |  |  |  |  |  |  | 508,000 |  |  |
Shares outstanding | 1,414,000 |  |  |  |  |  | 1,441,000 | 1,414,000 |  |
Weighted-average grant-date fair value | $ 27.96 |  |  |  |  |  | $ 35.40 | $ 27.96 |  |
Shares of restricted stock vested |  |  |  |  |  |  | 473,000 |  |  |
Performance Contingent Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 0 |  |  |
Shares granted to Directors |  |  | $ 25.87 | $ 25.76 | $ 22.16 | $ 20.73 |  |  |  |
Shares granted |  |  | 50,000 | 10,000 | 115,000 | 680,000 |  |  |  |
Shares expected to vest |  |  |  |  |  |  | 755,750 |  |  |
Shares outstanding |  |  |  |  |  |  | 795,000 |  |  |
Shares earned, but not vested |  |  |  |  |  |  | 755,750 |  |  |
Performance Contingent Restricted Stock | First Performance Segment |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance goals attainment period for PCRS awards |  |  |  |  |  | 3 years |  |  |  |
Performance Contingent Restricted Stock | Second Performance Segment |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance goals attainment period for PCRS awards |  |  |  |  |  | 5 years |  |  |  |
Non Vested Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 30,300,000 |  |  |
Unamortized stock-based compensation expense expected recognition period |  |  |  |  |  |  | 3 years 1 month 6 days |  |  |
Shares granted to Directors |  |  |  |  |  |  | $ 44.29 |  |  |
Shares granted |  |  |  |  |  |  | 605,000 |  |  |
Shares earned, but not vested | 3,060,000 |  |  |  |  |  | 2,994,000 | 3,060,000 |  |
Remaining weighted-average contractual term |  |  |  |  |  |  | 3 years 1 month 6 days |  |  |
Weighted-average grant-date fair value |  |  |  |  |  |  | $ 44.29 | $ 35.02 | 26.16 | $ 21.62
Shares of restricted stock vested |  |  |  |  |  |  | 664,000 |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of restricted stock vested | 121,733 |  |  |  |  |  | 172,855 |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 1,000,000 |  |  |
Omnibus Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Incentive plan approval date |  |  |  |  |  |  | Oct. 09, 2014 |  |  |
Shares of common stock authorized |  |  |  |  |  |  | 12,000,000 |  |  |
Omnibus Incentive Plan | Full Value Stock Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock authorized |  |  |  |  |  |  | 6,000,000 |  |  |
2014 Omnibus Incentive Plan |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock authorized |  |  |  |  |  |  | 6,000,000 |  |  |
2014 Omnibus Incentive Plan | Full Value Stock Award |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock authorized |  |  |  |  |  |  | 3,000,000 |  |  |
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 |  |  |  |  |  |  | $ 1,600,000 |  |  |
Shares granted to Directors |  |  |  |  |  |  | $ 43.89 | $ 36.63 | 26.63 |
Shares granted |  |  |  |  |  |  | 30,000 |  |  |
Shares earned, but not vested | 98,000 |  |  |  |  |  | 92,000 | 98,000 |  |
Shares of common stock available for grant |  | 500,000 |  |  |  |  | 132,750 |  |  |
Shares of restricted stock vested |  |  |  |  |  |  | 36,000 |  |  |
Employee Incentive Plan 2007 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 5,000,000 |  |  |
Shares granted to Directors |  |  |  |  |  |  | $ 44.60 |  |  |
Shares granted |  |  |  |  |  |  | 67,000 |  |  |
Shares outstanding | 857,000 |  |  |  |  |  | 859,000 | 857,000 |  |
Shares of common stock available for grant |  |  |  |  |  |  | 98,413 |  |  |
Weighted-average grant-date fair value | $ 33.80 |  |  |  |  |  | $ 44.60 | $ 33.80 | $ 25.87 |
Employee Incentive Plan 2007 | Scenario 1 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares of common stock available for grant |  |  |  |  |  |  | 1,000,000 |  |  |
Employee Incentive Plan 1997 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  |  |  |  | $ 100,000 |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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 fully vested and expected to vest options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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