Employee Benefit Plans (Details 9) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Swiss defined benefit pension plan	Mar. 31, 2013 Swiss defined benefit pension plan
Defined Contribution Plans
Expense for defined contribution plans	$ 6,600,000	$ 6,900,000	$ 11,600,000
Defined benefit plans
Unrecognized losses realized upon re-measurement of Swiss defined benefit pension plan				1,200,000	2,200,000
Net periodic benefit cost
Service costs	8,591,000	7,842,000	6,856,000
Interest costs	1,794,000	1,852,000	2,263,000
Expected return on plan assets	(1,727,000)	(1,710,000)	(1,969,000)
Amortization of net transition obligation	4,000	5,000	5,000
Net period service costs recognized	210,000	712,000	156,000
Net actuarial loss recognized	592,000	846,000	205,000
Settlement costs	769,000	2,658,000
Net periodic benefit cost	10,233,000	12,205,000	7,516,000
Changes in projected benefit obligations
Projected benefit obligation, beginning of year	90,234,000	97,459,000
Service costs	8,591,000	7,842,000	6,856,000
Interest costs	1,794,000	1,852,000	2,263,000
Plan participant contributions	2,726,000	2,814,000
Actuarial (gains) losses	(2,942,000)	7,146,000
Benefits paid	(1,841,000)	(2,285,000)
Plan amendments		(1,456,000)
Settlement and curtailment	(1,261,000)	(18,758,000)
Administrative expense paid	(174,000)	(164,000)
Foreign currency exchange rate changes	5,256,000	(4,216,000)
Projected benefit obligation, end of year	102,383,000	90,234,000	97,459,000
Accumulated benefit obligation	83,200,000	69,900,000
Changes in the fair value of defined benefit pension plan assets
Fair value of plan assets, beginning of year	48,689,000	53,594,000
Actual return on plan assets	5,334,000	2,913,000
Employer contributions	5,390,000	6,352,000
Plan participant contributions	2,726,000	2,814,000
Benefits paid	(1,841,000)	(2,285,000)
Settlement	(500,000)	(11,874,000)
Administrative expenses paid	(174,000)	(164,000)
Foreign currency exchange rate changes	3,760,000	(2,661,000)
Fair value of plan assets, end of year	$ 63,384,000	$ 48,689,000	$ 53,594,000