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Supplemental Disclosure of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash paid during the period for:
Income taxes, net	$ 11,864	$ 2,687
Interest	13,771	13,540
Non-cash financing activities:
Increase in interest expense - amortization of debt discount on 8.875% Senior Note	$ 77	$ 70

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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-Name Accounting Standards Codification

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-SubTopic 30

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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