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Employee Benefit Plans (Details) (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]          
Employer Matching Contribution, Percent of Match     6.00%    
Employees’ Capital Accumulation Plan, Total expense recognized $ 27,900,000 $ 40,700,000 $ 55,300,000 $ 82,300,000  
Employees’ Capital Accumulation Plan, Company-paid contributions 16,600,000 21,200,000 38,200,000 64,400,000  
Officer Medical Plan
         
Defined Benefit Plan Disclosure [Line Items]          
Service cost 1,021,000 1,186,000 2,042,000 2,372,000  
Interest cost 892,000 159,000 1,784,000 1,083,000  
Net actuarial loss 147,000 651,000 291,000 1,364,000  
Total benefit cost 2,060,000 1,996,000 4,117,000 4,819,000  
Defined benefit plan, unfunded status of plan $ 78,900,000   $ 78,900,000   $ 75,900,000