Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Jun. 30, 2016
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,340	$ 2,016
Preferred stock, par value
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	73,996,491	72,840,257
Treasury stock, shares	10,928,083	10,965,925