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Long Term Debt (Details) | 12 Months Ended |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 USD ($) | Sep. 30, 2012 US Revolver [Member] USD ($) | Mar. 31, 2012 US Revolver [Member] USD ($) | Sep. 30, 2012 US Revolver [Member] Maximum [Member] | Sep. 30, 2012 Canadian Revolver [Member] USD ($) | Mar. 31, 2012 Canadian Revolver [Member] USD ($) | Mar. 31, 2012 Canadian Revolver [Member] CAD | Feb. 29, 2012 Canadian Revolver [Member] USD ($) | Feb. 29, 2012 Canadian Revolver [Member] CAD | Sep. 30, 2012 Canadian Revolver [Member] Maximum [Member] | Sep. 30, 2012 Canadian Revolver [Member] Minimum [Member] | Sep. 30, 2012 Industrial Development Revenue Bonds [Member] USD ($) | Oct. 31, 2001 Industrial Development Revenue Bonds [Member] USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  | $ 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. |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Margin |  |  |  | 1.75% |  |  |  |  |  | 1.125% | 0.375% |  |
Outstanding letters of credit |  | 36,500,000 |  |  | 100,000 |  |  |  |  |  |  |  |
Amount of credit facility remaining borrowing capacity |  | 38,500,000 |  |  | 10,000,000 |  |  |  |  |  |  |  |
Maximum Fixed Charge Coverage Ratio | 125.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum Leverage Ratio | 275.00% |  |  |  |  |  |  |  |  |  |  |  |
Revolving canadian credit facility |  |  |  |  |  | 10,200,000 | 10,000,000 | 20,300,000 | 20,000,000 |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000
Reimbursement agreement requires annual redemptions |  |  |  |  |  |  |  |  |  |  |  | 400,000 |
Balance in the restricted sinking fund | $ 434,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 0.45% |

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