Contingencies - Additional Information (Detail) BRL in Millions, $ in Millions	1 Months Ended		3 Months Ended
	Nov. 22, 2011 USD ($)	Nov. 22, 2011 BRL	Jun. 30, 2015 BRL	May. 31, 2012 USD ($)	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 | Maximum
Loss Contingencies [Line Items]
Damages asserted by BK	$ 59.0
Total ordered damages granted to Bk	$ 8.5	BRL 26.7