Long Term Debt (Details Textual) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended				9 Months Ended
	Jun. 30, 2012	Oct. 31, 2001	Jun. 30, 2012 Revolving Credit Facility [Member]	Jun. 30, 2012 Revolving Credit Facility [Member]	Mar. 31, 2012 Revolving Credit Facility [Member]	Jun. 30, 2012 Revolving Credit Facility [Member] Maximum [Member]	Jun. 30, 2012 Revolving Credit Facility [Member] Minimum [Member]	Jun. 30, 2012 Canadian Facility [Member]	Jun. 30, 2012 Canadian Facility [Member] Maximum [Member]	Jun. 30, 2012 Canadian Facility [Member] Minimum [Member]
Long-Term Debt (Additional Textual) [Abstract]
Revolving credit facility	$ 9,800,000				$ 75,000,000
Revolving Credit Interest Rate			The interest rate for amounts outstanding under the Amended Credit Agreement for the US Revolver is a floating rate based upon the higher of the Federal Funds Rate plus 0.5%, or the bank’s prime rate.
Margin	0.50%					1.75%	0.50%		1.125%	0.375%
Outstanding letters of credit	41,100,000		0	0				0
US Revolver expires				Dec. 31, 2016
Credit Agreement Entrance Date								Dec. 15, 2009
Revolving canadian credit facility								20,000,000
Revolving amended canadian credit facility								9,800,000
Canadian Facility expires								Feb. 28, 2015
Long-Term Debt (Textual) [Abstract]
Federal Funds Rate / bank's prime rate	0.50%					1.75%	0.50%		1.125%	0.375%
Decrease In US Revolver	0
Amount of credit facility remaining borrowing capacity	33,900,000
Amended Credit Agreement is collateralized by a pledge of voting capital stock	100.00%
Non-domestic subsidiaries of voting capital stock	66.00%
Borrowings		8,000,000
Reimbursement agreement requires annual redemptions		400,000
Balance in the restricted sinking fund	$ 334,000
Interest rate	0.60%