Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Jun. 30, 2012
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	44,559,561	43,436,404
Common stock, shares outstanding	42,829,971	41,721,537
Treasury stock, shares	1,729,596	1,714,867