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Basis of Presentation - Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2017
Computation of basic and diluted earnings per share
Net income (loss) available to common stockholders	$ (46,951)	$ 4,833	$ (36,794)	$ 5,510
Weighted average shares outstanding-basic	18,971	19,036	18,874	18,989
Dilutive effect of equity awards		617		631
Weighted average shares outstanding-diluted	18,971	19,653	18,874	19,620
Basic earnings (loss) per share	$ (2.47)	$ 0.25	$ (1.95)	$ 0.29
Diluted earnings (loss) per share	$ (2.47)	$ 0.25	$ (1.95)	$ 0.28
Shares excluded from computation of diluted net income per share
Stock options excluded from computation due to antidilutive effect (in shares)	100			100
1.25% Convertible Senior Notes Due 2022
Per Share Computations
Interest rate (as a percentage)	1.25%		1.25%		1.25%

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