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Income Taxes -Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	(7.70%)	(6.50%)
Unrecognized tax benefits, uncertain tax positions	$ 6.5		$ 6.1
Unrecognized tax benefits, accrued interest	$ 0.4		$ 0.3

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
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X

- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Amount of interest expense accrued for an underpayment of income taxes.

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