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Goodwill and Other Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Changes in the carrying value of goodwill, by segment    
Beginning Balance $ 173,206 $ 117,305
Acquisitions 151,711 49,317
Effect of foreign currency translation changes (3,494) 395
Ending Balance 321,423 167,017
U.S./ Canada Operations [Member]
   
Changes in the carrying value of goodwill, by segment    
Beginning Balance 163,897 110,255
Acquisitions 57,653 49,317
Effect of foreign currency translation changes (1) 0
Ending Balance 221,549 159,572
Latin America [Member]
   
Changes in the carrying value of goodwill, by segment    
Beginning Balance 9,309 7,050
Acquisitions 54,765 0
Effect of foreign currency translation changes (2,752) 395
Ending Balance 61,322 7,445
Other International [Member]
   
Changes in the carrying value of goodwill, by segment    
Beginning Balance 0 0
Acquisitions 39,293 0
Effect of foreign currency translation changes (741) 0
Ending Balance $ 38,552 $ 0