Restructuring (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended				12 Months Ended		18 Months Ended		6 Months Ended		12 Months Ended		18 Months Ended		6 Months Ended		12 Months Ended		18 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Severance and retention incentives		Mar. 31, 2011 Severance and retention incentives		Sep. 30, 2011 Severance and retention incentives		Sep. 30, 2011 Other		Mar. 31, 2011 Other		Sep. 30, 2011 Other		Sep. 30, 2011 Restructuring Charges [Member]		Mar. 31, 2011 Restructuring Charges [Member]		Sep. 30, 2011 Restructuring Charges [Member]
Restructuring Disclosure [Abstract]
Total restructuring and transition-related costs, minimum			$ 125,000
Total restructuring and transition-related costs, maximum			135,000
Restructuring Reserve
Beginning Balance					23,211		0		0		5,835		0		0		29,046		0		0
Accrued charges					20,431		35,487				3,798		6,160				24,229		41,647
Payments					(24,177)		(12,276)				(9,265)		(325)				(33,442)		(12,601)
Ending Balance					19,465		23,211		19,465		368		5,835		368		19,833		29,046		19,833
Non-cash Charges					3,310	[1]	9,561	[1]	12,871	[1]	1,319	[1]	3,226	[1]	4,545	[1]	4,629	[1]	12,787	[1]	17,416	[1]
Transition-related costs	15,138	11,587	28,858	14,742
Restructuring and Related Cost, Cost Incurred to Date									68,789						14,503						83,292
Remaining transition-related costs, minimum			41,000		15,000						26,000
Remaining transition-related costs, maximum			$ 51,000		$ 22,000						$ 29,000

[1] Includes stock-based compensation expense and write-offs of capitalized costs, primarily for internally-developed software that will no longer be utilized as a result of the initiative.