Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011
Consolidated Balance Sheets [Abstract]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Common stock, shares issued	65,831,000	68,635,000	68,966,000
Common stock, shares outstanding	65,831,000	68,635,000	68,966,000
Treasury stock, shares	8,266,000	5,148,000	4,638,000