CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010
Equity:
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000	1,000,000
Preferred stock, shares outstanding (in shares)	0	0	0	0	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	49,000,000	49,000,000	49,000,000	49,000,000	49,000,000	49,000,000
Common stock, shares issued (in shares)	29,866,664	28,779,998	28,760,970	28,740,931	28,171,720	28,167,909
Common stock restricted shares (in shares)	403,195	649,007	641,496	645,708	732,308	741,086
Treasury stock shares (in shares)	9,756,955	9,126,966	9,089,723	9,108,440	9,118,549	9,125,253