Summary of the Status and Changes of Shares Subject to RSU Awards and the Related Average Price Per Share (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
RSU graded vesting period	3 years
Number of Shares
Nonvested June 30, 2014 (in shares)	449,288
Granted (in shares)	180,487
Vested (in shares)	(210,777)
Canceled (in shares)	(44,830)
Nonvested June 30, 2015 (in shares)	374,168	449,288
Weighted-Average Grant Date Fair Value
Nonvested June 30, 2014	$ 105.63
Granted	113.19
Vested	100.45
Canceled	108.68
Nonvested June 30, 2015	$ 111.82	$ 105.63
RSUs - Additional Disclosures
Stock-based compensation expense	$ 21,190	$ 22,547	$ 21,475
Expense for nonvested stock-based awards has yet to be recognized	$ 14,714
Expense for nonvested stock-based awards has yet to be recognized, amortized over a weighted-average period (in months)	17 months
Total fair value of shares vested	$ 21,173	18,953	18,007
Tax benefit relating to issuance of common stock for RSU awards	$ 870	$ 704	$ 2,509
Director [Member]
Number of Shares
Granted (in shares)	14,404
RSUs - Additional Disclosures
Stock-based compensation expense	$ 824