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Share-Based Payments - Additional Information (Detail) (2012 Long-Term Incentive Plan)	6 Months Ended
	Mar. 31, 2012
2012 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of common stock for issuance	6,000,000
Stock plan termination period	10 years
Stock option awards maximum term	7 years
Stock option awards vesting period	4 years

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).

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