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Current and Deferred Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Deferred Income Tax Assets And Liabilities
Income (loss) before income taxes	$ (11,952)	$ (22,434)	$ 73,513	$ 53,022
Current tax expense (benefit)	(5)	(1,372)	25,378	7,741
Deferred tax expense (benefit)	(4,359)	(9,273)	4,292	13,657
Total tax expense (benefit)	$ (4,364)	$ (10,645)	$ 29,670	$ 21,398

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.