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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]          
Employer Matching Contribution, Percent of Match     6.00%    
Employees’ Capital Accumulation Plan, Total expense recognized $ 27,000 $ 26,200 $ 81,400 $ 81,400  
Employees’ Capital Accumulation Plan, Company-paid contributions 14,600 14,900 46,600 53,100  
Officer Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1,426 1,022 4,277 3,064  
Interest cost 1,126 892 3,379 2,676  
Net actuarial loss 884 145 2,652 436  
Total benefit cost 3,436 $ 2,059 10,308 $ 6,176  
Defined benefit plan, unfunded status of plan $ 112,700   $ 112,700   $ 107,300