Share-Based Compensation - Summary of Stock Option Activity (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2014
Stock Options
Number of Options:
Outstanding at October 1, 2014 (shares)	833
Granted (shares)	0
Exercised (shares)	(52)
Forfeited (shares)	(8)
Outstanding at December 31, 2014 (shares)	773
Exercisable at December 31, 2014 (shares)	713
Wtd. Avg. Exercise Price (in dollars per share):
Outstanding at October 1, 2014 (dollars per share)	$ 33.52
Granted (dollars per share)	$ 0.00
Exercised (dollars per share)	$ 15.06
Forfeited (dollars per share)	$ 12.31
Outstanding at December 31, 2014 (dollars per share)	$ 34.98
Exercisable at December 31, 2014 (dollars per share)	$ 34.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Wtd. Avg. Remaining Contractual Life (Years), Outstanding at December 31, 2014	5 years
Wtd. Avg. Remaining Contractual Life (Years), Exercisable at December 31, 2014	5 years
Aggregate Intrinsic Value, Exercised	$ 1,012
Aggregate Intrinsic Value, Outstanding at December 31, 2014	1,641
Aggregate Intrinsic Value, Exercisable at December 31, 2014	$ 1,641

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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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.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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