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Long Term Debt (Narrative) (Details) (USD $) |  | 12 Months Ended |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2013 U.S. Revolver | Jun. 30, 2013 U.S. Revolver | Sep. 30, 2013 U.S. Revolver Maximum | Sep. 30, 2013 Canadian Revolver | Sep. 30, 2013 Canadian Revolver Maximum | Sep. 30, 2013 Canadian Revolver Minimum | Sep. 30, 2013 Industrial Development Revenue Bonds | Oct. 31, 2001 Industrial Development Revenue Bonds
Line Of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 75,000,000.0 |  |  |  |  |  |
Revolving credit interest rate |  | The interest rate for amounts outstanding under the Amended Credit Agreement for the U.S. Revolver is a floating rate based upon the higher of the Federal Funds Rate plus 0.5%, or the bank’s prime rate. |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |
Margin |  |  |  | 1.75% |  | 1.75% | 0.50% |  |
Outstanding letters of credit |  | 20,000,000 |  |  | 100,000 |  |  |  |
Amount of credit facility remaining borrowing capacity |  | 55,000,000 |  |  | 9,400,000 |  |  |  |
Credit facility expiration date |  | Dec. 31, 2016 |  |  | Feb. 28, 2015 |  |  |  |
Percentage of voting capital stock pledged as collateral |  | 100.00% |  |  |  |  |  |  |
Non-domestic subsidiaries of voting capital stock |  | 66.00% |  |  |  |  |  |  |
Revolving credit facility, current borrowing capacity |  |  |  |  | 9,500,000 |  |  |  |
Borrowings |  |  |  |  |  |  |  |  | 8,000,000
Reimbursement agreement requires annual redemptions |  |  |  |  |  |  |  | 400,000 |
Balance in the restricted sinking fund | $ 400,000 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 0.25% |

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