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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |
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May 31, 2014 | May 31, 2013 | May 31, 2012 | May 31, 2014 Stock Appreciation Rights (SARs) | May 31, 2014 Performance Based Restricted Stock Awards | May 31, 2013 Performance Based Restricted Stock Awards | May 31, 2012 Performance Based Restricted Stock Awards | Jul. 31, 2012 Performance Contingent Restricted Stock | Jun. 30, 2012 Performance Contingent Restricted Stock | Jul. 31, 2011 Performance Contingent Restricted Stock | Oct. 31, 2010 Performance Contingent Restricted Stock | May 31, 2014 Performance Contingent Restricted Stock | Oct. 31, 2010 Performance Contingent Restricted Stock First Performance Segment | Oct. 31, 2010 Performance Contingent Restricted Stock Second Performance Segment | May 31, 2014 Restricted Stock Unit | May 31, 2014 Non Vested Restricted Stock | May 31, 2013 Non Vested Restricted Stock | May 31, 2012 Non Vested Restricted Stock | Jun. 30, 2013 Restricted Stock [Member] | May 31, 2014 Restricted Stock [Member] | May 31, 2014 Omnibus Incentive Plan | May 31, 2014 Omnibus Incentive Plan Full Value Stock Award | Oct. 10, 2003 Directors Equity Incentive Plan 2003 | May 31, 2014 Directors Equity Incentive Plan 2003 | May 31, 2013 Directors Equity Incentive Plan 2003 | May 31, 2012 Directors Equity Incentive Plan 2003 | Oct. 10, 2003 Directors Equity Incentive Plan 2003 | May 31, 2014 Employee Incentive Plan Twenty Zero Seven | May 31, 2013 Employee Incentive Plan Twenty Zero Seven | May 31, 2012 Employee Incentive Plan Twenty Zero Seven | May 31, 2014 Employee Incentive Plan Twenty Zero Seven Scenario 1 | May 31, 2014 Nineteen Ninety Seven Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive plan approval date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 08, 2004 |  | Oct. 10, 2003 |  |  |  |  |  |  |  |  |
Stock appreciation rights expected term | 7 years 6 months | 7 years 6 months | 7 years 6 months | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation arrangement vesting period |  |  |  | 4 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Stock options outstanding | 59,450 |  |  | 3,159,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options outstanding | $ 64.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual life of options outstanding | 6 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable | 41.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual life of options exercisable | 4 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized stock-based compensation expense |  |  |  | 5.3 | 17.5 |  |  |  |  |  |  | 3.0 |  |  | 1.0 | 27.7 |  |  |  |  |  |  |  | 1.3 |  |  |  | 5.0 |  |  |  | 0.1
Unamortized stock-based compensation expense expected recognition period |  |  |  | 3 years 3 months |  |  |  |  |  |  |  |  |  |  |  | 3 years 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares expected to vest |  |  |  | 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares expected to vest, weighted-average exercise price |  |  |  | $ 27.20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares expected to vest, weighted-average remaining contractual term |  |  |  | 7 years 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |
Shares granted to Directors |  |  |  |  | $ 35.11 | $ 26.22 | $ 21.49 | $ 25.87 | $ 25.76 | $ 22.16 | $ 20.73 |  |  |  |  | $ 35.02 |  |  |  |  |  |  |  | $ 36.63 | $ 26.63 | $ 20.60 |  | $ 33.80 |  |  |  |
Shares granted |  |  |  |  | 507,000 |  |  | 50,000 | 10,000 | 115,000 | 680,000 |  |  |  |  | 613,000 |  |  |  |  |  |  |  | 30,000 |  |  |  | 76,000 |  |  |  |
Performance goals attainment period for PCRS awards |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares expected to vest | 2,600,000 |  |  |  |  |  |  |  |  |  |  | 596,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding |  |  |  |  | 1,414,000 | 1,454,000 |  |  |  |  |  | 795,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 857,000 | 815,000 |  |  |
Shares earned, but not vested |  |  |  |  |  |  |  |  |  |  |  | 392,500 |  |  |  | 3,060,000 | 3,236,000 |  |  |  |  |  |  | 98,000 | 113,000 |  |  |  |  |  |  |
Shares of common stock available for grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 162,750 |  |  | 500,000 | 159,183 |  |  | 1,000,000 |
Weighted-average grant-date fair value |  |  |  |  | $ 27.96 | $ 22.31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.80 | $ 25.87 | $ 22.16 |  |
Remaining weighted-average contractual term | 3 years 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant-date fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35.02 | $ 26.16 | $ 21.62 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested | 12.8 | 3.3 | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares expected to vest, weighted-average grant-date fair value | $ 24.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock vested |  |  |  |  | 520,000 |  |  |  |  |  |  |  |  |  |  | 682,000 |  |  | 56,291 | 121,733 |  |  |  | 45,000 |  |  |  | 14,000 |  |  |  |
Total intrinsic value of restricted shares converted | $ 10.4 | $ 1.3 | $ 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + 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 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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- 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 Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(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 option awards outstanding, 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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)(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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