Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		12 Months Ended	24 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended	24 Months Ended
	Dec. 31, 2011	Dec. 31, 2011	Dec. 31, 2012 Severance and Retention Incentives	Mar. 31, 2012 Severance and Retention Incentives	Mar. 31, 2012 Severance and Retention Incentives	Dec. 31, 2012 Other	Mar. 31, 2012 Other		Dec. 31, 2012 Restructuring Charges	Mar. 31, 2012 Restructuring Charges	Mar. 31, 2012 Restructuring Charges
Restructuring Reserve
Restructuring and Related Cost, Cost Incurred to Date					$ 79,686						$ 127,500
Non-cash charges, included in total transition-related costs											30,841
Transition-related costs	42,311	71,169
Restructuring Reserve
Beginning Balance			1,167	23,211		15,630	5,835		16,797	29,046
Accrued charges				29,096			25,916	[1]		55,012
Payments and other			(1,167)	(51,140)		(10,304)	(16,121)		(11,471)	(67,261)
Ending Balance			0	1,167	1,167	5,326	15,630		5,326	16,797	16,797
Restructuring Lease liability expense										$ 17,983

[1] Includes lease loss accruals of $17,983 for space permanently abandoned.