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Basis of Presentation - Earnings Per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Computation of basic and diluted earnings per share        
Net income available to common stockholders $ 42,735 $ 18,773 $ 81,584 $ 48,155
Weighted average shares outstanding-basic 17,417 17,969 17,734 17,981
Dilutive effect of equity awards 292 329 302 297
Weighted average shares outstanding-diluted 17,709 18,298 18,036 18,278
Basic earnings per share $ 2.45 $ 1.04 $ 4.60 $ 2.68
Diluted earnings per share $ 2.41 $ 1.03 $ 4.52 $ 2.63
Shares excluded from diluted earnings per share due to their anti-dilutive effect 211 51 62 64
Dilutive effect of the Notes 0 0 0 0
1.25% Convertible Senior Notes Due 2022        
Per Share Computations        
Interest rate (as a percentage) 1.25%   1.25%  
Computation of basic and diluted earnings per share        
Conversion price $ 107.46   $ 107.46