Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease, right-of-use asset	$ 184,544	$ 185,012
Operating lease, liability	$ 224,189	$ 215,008
Weighted-average remaining lease term	6 years 11 months 12 days	6 years 9 months 18 days
Weighted-average discount rate	5.95%	5.95%