Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 19,346,000	$ 22,369,000	$ 76,250,000	$ 64,515,000
Effective tax rate	21.60%	23.30%	22.10%	25.20%
Unrecognized tax benefits	45,100,000		45,100,000
Interest related to unrecognized tax benefits			2,500,000
Increase in tax reserves on uncertain tax positions	2,100,000		900,000
Increase in interest expense on uncertain tax positions	$ 200,000		$ 100,000