Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Goodwill [Line Items]
Goodwill at September 30, 2012			$ 2,942,984,000
Goodwill, Other Changes	2,261,000
Goodwill at December 31, 2012	2,945,245,000		2,945,245,000
Indefinite-lived intangibles-trade names	343,928,000		343,928,000		344,004,000
Finite Lived Intangible Assets [Line Items]
Intangible Assets Gross Excluding Goodwill	677,668,000		677,668,000		677,881,000
Intangible Assets Accumulated Amortization Excluding Goodwill	110,913,000		110,913,000		97,433,000
Intangible Assets Net Excluding Goodwill	566,755,000		566,755,000		580,448,000
Amortization of Intangible Assets	6,799,000	4,630,000	13,609,000	8,622,000
Future Amortization Expense Year One	27,100,000		27,100,000
Future Amortization Expense Year Two	25,300,000		25,300,000
Future Amortization Expense Year Three	21,300,000		21,300,000
Future Amortization Expense Year Four	20,400,000		20,400,000
Future Amortization Expense Year Five	16,900,000		16,900,000
Future Amortization Expense, after Year Five	125,400,000		125,400,000
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	265,857,000		265,857,000		265,981,000
Finite Lived Intangible Assets Accumulated Amortization	71,305,000		71,305,000		61,865,000
Finite Lived Intangible Assets Net	194,552,000		194,552,000		204,116,000
Other Finite Lived Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	67,883,000		67,883,000		67,896,000
Finite Lived Intangible Assets Accumulated Amortization	39,608,000		39,608,000		35,568,000
Finite Lived Intangible Assets Net	28,275,000		28,275,000		32,328,000
Pharmaceutical Distribution [Member]
Goodwill [Line Items]
Goodwill at September 30, 2012					2,422,975,000
Goodwill, Other Changes	(739,000)
Goodwill at December 31, 2012	2,422,236,000		2,422,236,000		2,422,975,000
Other Segment [Member]
Goodwill [Line Items]
Goodwill at September 30, 2012					520,009,000
Goodwill, Other Changes	3,000,000
Goodwill at December 31, 2012	$ 523,009,000		$ 523,009,000		$ 520,009,000