Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 63,619	$ 65,419	$ 81,789
Denominator: Weighted-average shares, basic (in shares)	26,472,000	28,558,000	28,337,000
Denominator: Dilutive effect of share-based payments (in shares)	215,000	241,000	265,000
Denominator: Weighted-average shares, diluted (in shares)	26,687,000	28,799,000	28,602,000
Net income per common share, basic (in dollars per share)	$ 2.40	$ 2.29	$ 2.89
Net income per common share, diluted (in dollars per share)	$ 2.38	$ 2.27	$ 2.86
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	461,090	340,697	230,706