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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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Deferred Income Tax Assets And Liabilities
Income (loss) before income taxes	$ (16,618)	$ (11,952)	$ 105,514	$ 73,513
Current tax expense (benefit)	(7,888)	(5)	34,550	25,378
Deferred tax expense (benefit)	862	(4,359)	9,052	4,292
Total tax expense (benefit)	$ (7,026)	$ (4,364)	$ 43,602	$ 29,670

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.