Income Taxes (Details 4) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Net operating loss and tax credit carryforwards
Capital loss carryforwards	$ 4,600,000
Cumulative amount of unremitted earnings of non-Swiss subsidiaries	157,400,000
Percentage of likelihood of realization of recognized tax benefit	50.00%
Unrecognized tax benefits that would impact effective tax rate	86,100,000	90,300,000
Non-current income taxes payable	93,126,000	98,827,000
Current income taxes payable	300,000
Aggregate changes in gross unrecognized tax benefits
Balance at the beginning of the period	95,698,000	136,888,000	130,498,000
Lapse of statute of limitations	(12,514,000)	(6,490,000)	(6,760,000)
Settlements with tax authorities	(100,000)	(42,770,000)
Decreases in balances related to tax positions taken during prior years	(778,000)	(1,500,000)	(1,200,000)
Increases in balances related to tax positions taken during the year	8,740,000	9,570,000	14,350,000
Balance at the end of the period	91,046,000	95,698,000	136,888,000
Interest and penalties in income tax expense	1,100,000	1,000,000	1,200,000
Accrued interest and penalties related to uncertain tax positions	5,600,000	6,600,000	7,500,000
Minimum
Net operating loss and tax credit carryforwards
Decreases in uncertain tax positions taken during prior years	16,000,000
Maximum
Net operating loss and tax credit carryforwards
Decreases in uncertain tax positions taken during prior years	18,300,000
Foreign
Net operating loss and tax credit carryforwards
Foreign net operating loss carryforwards	196,000,000
Foreign tax credit carryforwards	35,700,000
Net operating loss if realized, to be credited to equity	136,200,000
Tax credit carryforwards if realized, to be credited to equity	$ 22,700,000