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Summary of Significant Accounting Policies and New Accounting Standards - Calculation of diluted net income per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Summary of Significant Accounting Policies and New Accounting Standards      
Net income $ 54,385 $ 33,552 $ 54,713
Weighted average number of shares - basic (in shares) 40,473 40,454 40,412
Dilutive effect of stock options and restricted stock units 31 50 111
Weighted average number of shares - diluted (in shares) 40,504 40,504 40,523
Net income per share      
basic (in dollars per share) $ 1.34 $ 0.83 $ 1.35
diluted (in dollars per share) $ 1.34 $ 0.83 $ 1.35