Leases (Right-of-use Assets and Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 115,184
Finance Lease, Right-of-Use Asset	$ 2,207
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAbstract
Total right-of-use assets	$ 117,391
Current liabilities: Operating leases	32,753
Current liabilities: Finance leases	$ 592
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtCurrent
Noncurrent liabilities: Operating leases	$ 95,514
Noncurrent liabilities: Finance leases	$ 1,640
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent
Total lease liabilities	$ 130,499