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Basis of Presentation - Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income available to common stockholders	$ 18,773	$ 19,558	$ 48,155	$ 61,287
Weighted average shares outstanding-basic	17,969	18,182	17,981	18,251
Dilutive effect of equity awards	329	331	297	442
Dilutive effect of the Notes	0	0	0	0
Weighted average shares outstanding-diluted	18,298	18,513	18,278	18,693
Basic earnings per share	$ 1.04	$ 1.08	$ 2.68	$ 3.36
Diluted earnings per share	$ 1.03	$ 1.06	$ 2.63	$ 3.28
Shares excluded from diluted earnings per share due to their anti-dilutive effect	51	145	64	100
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%		1.25%
Computation of basic and diluted earnings per share
Conversion price	$ 107.46		$ 107.46

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