Employee Benefit Plans (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2014
Employee Benefit Plan
Unamortized Expense	$ 45,353
Stock options
Employee Benefit Plan
Unamortized Expense	980
Remaining Months	17 months
Premium-priced stock options
Employee Benefit Plan
Unamortized Expense	789
Remaining Months	19 months
Market-based options
Employee Benefit Plan
Unamortized Expense	1,304
Remaining Months	9 months
Time-based RSUs
Employee Benefit Plan
Unamortized Expense	37,379
Remaining Months	22 months
Market-based RSUs
Employee Benefit Plan
Unamortized Expense	$ 4,901
Remaining Months	27 months