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Contingencies - Additional Information (Detail) BRL in Millions, $ in Millions	1 Months Ended		3 Months Ended
	Nov. 22, 2011 USD ($)	Nov. 22, 2011 BRL	Sep. 30, 2015 BRL	May. 31, 2012 USD ($)	Jun. 30, 2010 USD ($)
Loss Contingencies [Line Items]
Damages asserted by BK | BRL			BRL 20.8
Accrual for Environmental Loss Contingencies					$ 100.0
Business combination, recognized identifiable assets acquired and liabilities assumed, contingent liability				$ 2.9
Court-Imposed Interest, Fees or Inflation Adjustments
Loss Contingencies [Line Items]
Total ordered damages granted to Bk	$ 6.5
Court-Imposed Interest, Fees or Inflation Adjustments | Maximum
Loss Contingencies [Line Items]
Damages asserted by BK	$ 45.0
Total ordered damages granted to Bk | BRL		BRL 26.7

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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