Common Stock Repurchase Program (Details) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
	Nov. 15, 2012	Jun. 30, 2013	Jun. 30, 2013
Stockholders' Equity Note [Abstract]
Stock repurchase program, authorized amount	$ 40,000,000.0
Stock repurchase program, period in force	3 years
Treasury stock, shares acquired (shares)		56,000	303,600
Treasury stock, value, acquired, cost method		1,200,000	4,800,000
Treasury stock acquired, average cost (usd per share)		$ 20.87	$ 15.92
Stock repurchase program, remaining authorized repurchase amount			$ 35,200,000