Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1,721	$ 936
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	107,969,000	107,479,000
Common stock, shares outstanding (shares)	103,690,000	103,461,000
Treasury stock, shares (shares)	4,279,000	4,018,000