Reportable Segments and Geographic Information (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Geographic Information
Revenue	$ 2,082,900,000	$ 2,095,200,000	$ 2,010,900,000	$ 2,029,200,000	$ 2,118,100,000	$ 2,046,700,000	$ 1,936,400,000	$ 1,936,200,000	$ 8,218,180,000	$ 8,037,374,000	$ 6,545,791,000
Long-Lived Assets	2,390,300,000				2,716,300,000				2,390,300,000	2,716,300,000	2,191,400,000
United States
Geographic Information
Revenue									4,756,000,000	4,806,400,000	3,982,900,000
Long-Lived Assets	1,496,800,000				1,683,200,000				1,496,800,000	1,683,200,000	1,618,700,000
Asia Pacific
Geographic Information
Revenue									1,715,100,000	1,421,000,000	982,100,000
Long-Lived Assets	374,900,000				349,500,000				374,900,000	349,500,000	172,500,000
Canada
Geographic Information
Revenue									708,800,000	686,400,000	640,700,000
Long-Lived Assets	189,200,000				182,000,000				189,200,000	182,000,000	149,600,000
Europe
Geographic Information
Revenue									608,200,000	643,000,000	494,200,000
Long-Lived Assets	243,600,000				372,200,000				243,600,000	372,200,000	207,400,000
Other Foreign Countries
Geographic Information
Revenue									430,100,000	480,600,000	445,900,000
Long-Lived Assets	$ 85,800,000				$ 129,400,000				$ 85,800,000	$ 129,400,000	$ 43,200,000