Significant Accounting Policies (Details 4)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Tax provision (benefit) at statutory U.S. federal income tax rate	(35.00%)	35.00%	(35.00%)	35.00%
Effect of changes in valuation allowances	4.50%	11.00%	4.50%	1.80%
Effect of changes in unrecognized tax benefits	(2.40%)	0.00%	(2.70%)	(0.50%)
Changes in U.K. tax rates on deferred tax assets and liabilities	0.00%	0.00%	(3.20%)	(9.40%)
Other jurisdiction income taxes and other items, net (primarily foreign taxes in 2011)	4.70%	(19.60%)	6.20%	(6.80%)
Effective income tax provision (benefit) rate	(28.20%)	26.40%	(30.20%)	20.10%