Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 9,823
Finance lease liabilities	9,975
Operating lease right-of-use assets	33,180	$ 33,900
Operating lease liabilities	$ 34,319	$ 34,900
Weighted-average lease term
Finance leases	8 years 7 months 28 days
Operating leases	9 years 3 months 25 days
Weighted-average discount rate
Finance leases	2.99%
Operating leases	3.57%