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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Net income	$ 54,713	$ 64,883	$ 64,615
Weighted average number of shares - basic	40,412	40,181	39,524
Dilutive effect of stock options and restricted stock units	111	204	518
Weighted average number of shares - diluted	40,523	40,385	40,042
Net income per share
basic (in dollars per share)	$ 1.35	$ 1.61	$ 1.63
diluted (in dollars per share)	$ 1.35	$ 1.61	$ 1.61

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