Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense	$ 29,132,000	$ 23,470,000	$ 56,904,000	$ 42,146,000
Effective tax rate	20.00%	24.70%	22.20%	26.30%
Unrecognized tax benefits	43,100,000		43,100,000
Interest related to unrecognized tax benefits	2,300,000
Decrease in tax reserves on uncertain tax positions	$ (500,000)		$ (1,100,000)