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Supplemental Disclosure of Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Cash paid during the period for:
Income taxes, net	$ 25,518	$ 16,137	$ 6,175
Interest	16,968	14,376	14,487
Non-cash financing activities:
Increase in interest expense-amortization of debt discount on 8.875% Senior Note	$ 112	$ 103	$ 94

X

- Definition

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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- Definition

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

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