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Quarterly Results for 2015 and 2014 - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2015 USD ($)
Quarterly Financial Information Disclosure [Abstract]
Increase in revenue during period	$ 57.6
Increase in operating expenses	$ 46.7

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- Definition

Increase decrease in operating expenses.

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Increase in revenue during period.

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