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Employee Retirement Plans (Narrative) (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, minimum annual contributions per participating employee (as percent) 1.00%    
Defined contribution plan, maximum annual contributions per employee (as percent) 70.00%    
Defined contribution plan, cost recognized $ 1,500,000 $ 1,600,000 $ 900,000
Defined benefit obligation 60,334,000 61,882,000 61,714,000
Net periodic benefit cost (income) (less than $1.0 million) $ (690,000) $ (372,000) (6,000)
Expected return on plan assets, net of administrative fees (as percent) 5.75% 6.25%  
Qualified plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Contributions to the qualified plan $ 1,000,000 $ 0 $ 6,000,000
Unfunded plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined benefit obligation $ 4,600,000 $ 5,900,000  
Contribution Tranche One      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer matching contribution, percent of match (as percent) 100.00%    
Defined contribution plan, employer matching contribution, percent of employees pay (as percent) 3.00%    
Contribution Tranche Two      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer matching contribution, percent of match (as percent) 50.00%    
Defined contribution plan, employer matching contribution, percent of employees pay (as percent) 3.00%