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Income Taxes (Components of Benefit from Income Taxes) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Domestic	$ (5,432)	$ 9,267	$ (17,576)	$ (1,842)
Foreign	6,106	2,200	9,689	3,900
Provision (benefit) from income taxes	$ 674	$ 11,467	$ (7,887)	$ 2,058
Effective tax rate	(2.70%)	92.80%	14.10%	16.70%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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