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Retirement Plans (narrative) (detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
General Discussion Of Pension And Other Postretirement Benefits [Abstract]      
Decrease in Unfunded Status $ 17,200    
Defined Benefit Plan, Benefit Obligation 214,036 $ 212,908 $ 170,478
Employer contributions 23,100 350  
Fair value of plan assets at end of year 176,238 157,948 154,650
Defined Benefit Plan, Accumulated Benefit Obligation $ 195,300 $ 188,500  
Expected return 7.25% 7.25%  
Loss on plan assets 1.40%    
Common stock included in plan assets $ 18,400 $ 14,400  
401 (k) match 1,800 2,300 2,300
401 (k) match stock amount 1,800 2,200  
401 (k) match amount in cash   100  
Change in pension and post retirement benefits adjustment (net of tax) (3,408) 20,552 (11,296)
Teamsters Plan Contributions $ 2,500 $ 2,400 2,400
Contribution Percentage 5.00%    
Discount rate - benefit obligation 4.36% 4.15%  
Change in pension and post retirement benefits adjustment tax $ 2,179 $ 13,140 $ 7,222