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Stockholders' Equity (Detail) (USD $) |  |  |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2010 | Sep. 30, 2009 | Dec. 02, 2005 | Sep. 30, 2014 Minimum | Sep. 30, 2014 Maximum | Sep. 30, 2014 Options granted to employees Performance-based | Sep. 30, 2014 Options granted to employees Performance-based Minimum | Sep. 30, 2014 Options granted to employees Performance-based Maximum | Sep. 30, 2014 Incentive stock options Holder of at least 10% of common stock Minimum | Sep. 30, 2014 Employee and director options | Sep. 30, 2013 Employee and director options | Sep. 30, 2012 Employee and director options | Sep. 30, 2011 Employee and director options | Sep. 30, 2010 Employee and director options | Sep. 30, 2014 Employee and director options Minimum | Sep. 30, 2013 Employee and director options Minimum | Sep. 30, 2012 Employee and director options Minimum | Sep. 30, 2011 Employee and director options Minimum | Sep. 30, 2010 Employee and director options Minimum | Sep. 30, 2014 Employee and director options Maximum | Sep. 30, 2013 Employee and director options Maximum | Sep. 30, 2012 Employee and director options Maximum | Sep. 30, 2011 Employee and director options Maximum | Sep. 30, 2010 Employee and director options Maximum | Sep. 30, 2014 Restricted shares | Sep. 30, 2013 Restricted shares | Sep. 30, 2012 Restricted shares | Sep. 30, 2011 Restricted shares | Sep. 30, 2010 Restricted shares | Sep. 30, 2014 Restricted shares Minimum | Sep. 30, 2013 Restricted shares Minimum | Sep. 30, 2012 Restricted shares Minimum | Sep. 30, 2011 Restricted shares Minimum | Sep. 30, 2010 Restricted shares Minimum | Sep. 30, 2014 Restricted shares Maximum | Sep. 30, 2013 Restricted shares Maximum | Sep. 30, 2012 Restricted shares Maximum | Sep. 30, 2011 Restricted shares Maximum | Sep. 30, 2010 Restricted shares Maximum | Sep. 30, 2013 Restricted shares Performance-based Non-employee | Sep. 30, 2012 Restricted shares Performance-based Non-employee | Sep. 30, 2014 Options or stock appreciation rights Maximum | Sep. 30, 2014 Other than options or stock appreciation rights Maximum
2006 Omnibus Long-Term Incentive Plan (the 2006 Plan) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Actual payout as a percent of employee target payout, based upon the entity's actual performance during the previous twelve months |  |  |  |  |  |  |  | 0.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares reserved for issuance | 772,227 | 3,986,513 | 5,189,996 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  |  |  |  | 437,755 | 171,994 | 181,783 | 321,072 | 624,566 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted, exercise prices (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 22.41 | $ 35.76 | $ 34.42 |  |  | $ 21.53 | $ 29.47 | $ 31.37 | $ 14.30 | $ 9.05 | $ 31.37 | $ 46.72 | $ 42.31 | $ 17.02 | $ 13.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  |  |  | 181,094 | 32,244 | 78,148 | 73,591 | 75,467 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,040,748 | 997,857 | 633,647 | 736,340 | 699,410 |  |  |  |  |  |  |  |  |  |  | 335,000 | 100,000 |  |
Restricted shares granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.78 | $ 36.97 | $ 34.05 |  |  | $ 13.11 | $ 29.47 | $ 31.37 | $ 12.88 | $ 9.05 | $ 38.09 | $ 42.47 | $ 52.55 | $ 25.52 | $ 13.96 |  |  |  |
Restricted shares forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,586 | 403,083 | 138,052 | 150,112 | 45,026 |  |  |  |  |  |  |  |  |  |  | 281,500 |  |  |
Number of shares awarded per person per year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 700,000
Shares and options vesting period |  |  |  |  | 1 year | 4 years | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of stock option as a percentage of the fair market value of the common stock on the date of grant |  |  |  |  |  |  |  |  |  | 110.00% |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of stock option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the actual payout as a percent of employee target payout which is based upon the entity's actual performance during the previous twelve months. + References No definition available. + Details
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- Definition Represents the number of shares that can be awarded to any person under the stock based compensation plan per year. + References No definition available. + 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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -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 Period from grant date that an equity-based award expires, 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)(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 For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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