Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Consolidated Balance Sheets
Accounts receivable, reserve (in dollars)	$ 6,181	$ 4,597
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	160,000,000	160,000,000
Common stock, shares issued	110,987,546	110,508,605
Common stock, shares outstanding	107,767,915	108,232,284
Preferred stock, no par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Treasury stock, shares	3,219,631	2,276,321