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Debt (Details)
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2014
Receivables Securitization Facility [Member]
USD ($)
Sep. 30, 2013
Receivables Securitization Facility [Member]
USD ($)
Sep. 30, 2014
Australian Seasonal Credit Facility [Member]
USD ($)
Sep. 30, 2014
Australian Seasonal Credit Facility [Member]
AUD
Sep. 30, 2013
Australian Seasonal Credit Facility [Member]
USD ($)
Sep. 30, 2014
Unsecured Syndicated Senior Credit Facility [Member]
USD ($)
Sep. 30, 2013
Unsecured Syndicated Senior Credit Facility [Member]
USD ($)
Long-term debt [Abstract]                  
Australian Seasonal Credit Facility         $ 2,618,000   $ 0    
Receivables Securitization Facility     80,000,000 0          
Revolving Credit Facility               311,120,000 260,432,000
Total debt 393,738,000 260,432,000              
Australian Seasonal Credit Facility Borrowing Capacity           3,000,000