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Operating Segment Information (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues $ 272,074 $ 256,278 $ 549,200 $ 505,151  
Long-lived assets 612,590 458,129 612,590 458,129 527,979
U.S. [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 222,947 225,490 447,703 451,205  
Long-lived assets 393,698 298,031 393,698 298,031 317,887
Mexico [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 36,896 26,706 77,141 46,127  
Long-lived assets 167,904 148,812 167,904 148,812 155,488
Canada [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 4,729 3,952 9,543 7,613  
Long-lived assets 9,177 11,021 9,177 11,021 10,199
U.K. [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Revenues 7,502 130 14,813 206  
Long-lived assets 41,769 223 41,769 223 44,363
Other [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Long-lived assets $ 42 $ 42 $ 42 $ 42 $ 42