Rental Expense and Lease Commitments (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Operating Leased Assets [Line Items]
Short-term Lease, Cost	$ 0
Sublease Income	0
Variable Lease, Cost	0
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	8,285,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	7,756,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	6,853,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	4,662,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,190,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five	12,136,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	43,882,000
Receivable with Imputed Interest, Discount	5,329,000
Operating Lease, Payments	$ 8,593,000
Operating Lease, Weighted Average Remaining Lease Term	6 years 8 months 26 days
Operating Lease, Right-of-Use Asset	$ 38,125,000	$ 35,553,000
Operating Lease, Weighted Average Discount Rate, Percent	4.05%
Operating Lease, Liability, Current	$ 6,924,000	0
Operating Lease, Liability, Noncurrent	31,629,000	0
Operating Lease, Liability	38,553,000
Operating Lease, Cost	8,869,000	$ 12,248,000	$ 13,020,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 10,589,000
Minimum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Lessee, Operating Lease, Term of Contract	15 years