Credit Facility (Narrative) (Details) (USD $)	0 Months Ended	12 Months Ended					0 Months Ended
	Nov. 14, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Old Credit Agreement [Member]	Sep. 30, 2010 Old Credit Agreement [Member]	Nov. 14, 2011 New Credit Agreement [Member]	Sep. 30, 2012 New Credit Agreement [Member]	Nov. 14, 2011 Federal Funds Purchased [Member]	Nov. 14, 2011 LIBO Rate for Deposits [Member]	Jun. 30, 2012 Base Rate [Member]	Jun. 30, 2012 LIBOR Rate [Member]
Debt Instrument [Line Items]
Borrowings outstanding under credit agreement		$ 146,647,000	$ 0	$ 0			$ 132,887,000
Borrowings outstanding under credit agreement					19,805,000	18,000,000		141,347,000
Senior secured reducing revolving credit facility							175,000,000
Revolving credit agreement, term length							5 years
Revolving credit facility, ability to increase line by additional							25,000,000
Percentage of domestic subsidiary stock pledged							100.00%
Percentage of first-tier foreign subsidiary pledged							66.00%
Additional borrowing rate									0.50%	1.00%
Credit facility, interest period on the borrowing day	1 month
Credit facility, minimum net worth							65,000,000
Maximum leverage ratio range, upper limit							3.00
Maximum leverage ratio range, lower limit							1.00
Minimum leverage ratio range, upper limit							2.50
Minimum leverage ratio range, lower limit							1.00
Minimum fixed charge coverage ratio range, upper limit							1.15
Minimum fixed charge coverage ratio range, lower limit							1.00
Maximum fixed charge coverage ratio range, upper limit							1.35
Maximum fixed charge coverage ratio range, lower limit							1.00
Grace period to pay any principal when due or any interest, business days							3 days
Repayment of borrowings		5,300,000	0	0
Interest expense on borrowings under new and old credit facilities		$ 3,627,000
Weighted average interest rate		3.03%
Weighted average interest rate											4.75%	2.735%