Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense	$ 23,470,000	$ 14,788,000	$ 42,146,000	$ 31,999,000
Effective tax rate	24.70%	23.70%	26.30%	23.90%
Unrecognized tax benefits	36,100,000		36,100,000
Interest related to unrecognized tax benefit			2,600,000
Tax reserves on uncertain tax positions	200,000		1,000,000
Additional interest expense on uncertain tax positions	$ 400,000		$ 500,000