Share-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Mar. 31, 2016	Jun. 30, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Outstanding at June 30, 2015, Shares	837,398
Number of stock options, granted	0
Exercised, Shares	(120,677)
Forfeited or expired, Shares	(27,128)
Outstanding at March 31, 2016, Shares	689,593	837,398
Exercisable at March 31, 2016, Shares	571,466
Outstanding at June 30, 2015, Weighted Average Exercise Price Per Share	$ 70.40
Granted, Weighted Average Exercise Price Per Share	0.00
Exercised, Weighted Average Exercise Price Per Share	53.25
Forfeited or expired, Weighted Average Exercise Price Per Share	88.44
Outstanding at March 31, 2016, Weighted Average Exercise Price Per Share	72.69	$ 70.40
Exercisable at March 31, 2016, Weighted Average Exercise Price Per Share	$ 73.94
Outstanding, Weighted Average Remaining Contractual Term (Years)	4 years 10 months 21 days	5 years 7 months 13 days
Exercisable at March 31, 2016, Weighted Average Remaining Contractual Term (Years)	4 years 4 months 10 days
Outstanding at June 30, 2015, Aggregate Intrinsic Value	$ 40,864
Outstanding at March 31, 2016, Aggregate Intrinsic Value	16,878	$ 40,864
Exercisable at March 31, 2016, Aggregate Intrinsic Value	$ 14,167