Leases (Supplemental Cash Flow Information) (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2020 USD ($)
Leases [Abstract]
Operating Leases: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows	$ 20,747
Operating Leases: Right-of-use assets obtained in exchange for lease liabilities	11,733
Finance Leases: Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows	67
Finance Leases: Cash paid for amounts included in the measurement of lease liabilities: Financing cash flows	298
Finance Leases: Right-of-use assets obtained in exchange for lease liabilities	$ 363