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Business Acquisitions, Goodwill and Intangible Assets (Details 3) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
item
Sep. 30, 2012
EMEA [Member]
Sep. 30, 2011
EMEA [Member]
Sep. 30, 2014
Unconsolidated Joint Ventures [Member]
Sep. 30, 2014
Professional Technical Services [Member]
Sep. 30, 2013
Professional Technical Services [Member]
Sep. 30, 2012
Professional Technical Services [Member]
Sep. 30, 2012
Management Support Services [Member]
Sep. 30, 2011
Management Support Services [Member]
Sep. 30, 2014
Management Support Services [Member]
Sep. 30, 2013
Management Support Services [Member]
Goodwill                          
Market multiple of revenue       0.35 0.50         0.35 0.50    
Carrying value before impairment       $ 345,500,000           $ 347,800,000      
Goodwill impairment     (336,000,000) (155,000,000)         (155,000,000) (181,000,000)      
Carrying value after impairment       190,500,000           166,800,000      
Goodwill Impairment, net of tax     317,200,000                    
Changes in the carrying value of goodwill by reporting segment                          
Goodwill at the beginning of the period 1,811,754,000   1,775,400,000       1,645,000,000   1,608,600,000 166,800,000   166,800,000 166,800,000
Post-Acquisition Adjustments 5,000,000           5,000,000            
Foreign Exchange Impact (31,300,000) (36,200,000)         (31,300,000) (36,200,000)          
Acquired 151,800,000 72,600,000       79,100,000 151,800,000 72,600,000          
Goodwill impairment     (336,000,000) (155,000,000)         (155,000,000) (181,000,000)      
Goodwill at the end of the period $ 1,937,338,000 $ 1,811,754,000         $ 1,770,500,000 $ 1,645,000,000     $ 166,800,000 $ 166,800,000 $ 166,800,000
Number of reporting units     2