Leases - Supplemental Cash Flow Information (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 37
Operating cash flows from operating leases	28,593
Financing cash flows from finance leases	461
Supplemental non-cash information on lease liabilities arising from right-of-use assets:
Right-of-use assets obtained in exchange for new finance lease liabilities	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 11,902