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Basis of Presentation (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
item
$ / shares
shares
Mar. 31, 2015
USD ($)
$ / shares
shares
Description of Business        
Number of operating segments | item     3  
Computation of basic and diluted earnings per share        
Net income for diluted earnings per share calculation | $ $ 9,343 $ 13,228 $ 20,256 $ 42,718
Weighted average shares outstanding-for basic earnings per share calculation 19,336 19,801 19,604 19,810
Dilutive effect of stock awards (in shares) 605 728 657 705
Weighted average shares outstanding-for diluted earnings per share calculation 19,941 20,529 20,261 20,515
Basic net income per share (in dollars per share) | $ / shares $ 0.48 $ 0.67 $ 1.03 $ 2.16
Diluted net income per share (in dollars per share) | $ / shares $ 0.47 $ 0.64 $ 1.00 $ 2.08
Shares excluded from computation of diluted net income per share:        
Weighted average stock options excluded from computation due to anti-dilutive effect 70 49 39 43