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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income	$ 69,246	$ 63,619	$ 65,419
Denominator:
Weighted-average shares, basic (in shares)	25,318,000	26,472,000	28,558,000
Dilutive effect of share-based payments (in shares)	197,000	215,000	241,000
Weighted-average shares, diluted (in shares)	25,515,000	26,687,000	28,799,000
Net income per common share, basic (in dollars per share)	$ 2.74	$ 2.40	$ 2.29
Net income per common share, diluted (in dollars per share)	$ 2.71	$ 2.38	$ 2.27
Weighted average shares excluded from the computation of diluted earnings per share (in shares)	418,325	461,090	340,697

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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