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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income	$ 33,153	$ 69,246	$ 63,619
Denominator:
Weighted-average shares, basic (in shares)	25,522,000	25,318,000	26,472,000
Dilutive effect of share-based payments (in shares)	102,000	197,000	215,000
Weighted-average shares, diluted (in shares)	25,624,000	25,515,000	26,687,000
Net income per common share, basic (in dollars per share)	$ 1.30	$ 2.74	$ 2.40
Net income per common share, diluted (in dollars per share)	$ 1.29	$ 2.71	$ 2.38
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	551,320	418,325	461,090

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