Fair Value Measurements - Input Hierarchy of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018
Total Assets / Liabilities at Fair Value
Assets
Derivative financial instruments	$ 3	$ 186	$ 6
Securitized beneficial interests	14,648	40,332	17,736
Total assets	14,651	40,518	17,742
Liabilities
Long-term debt	815,389	830,785	864,331
Guarantees	3,136	3,714	3,544
Total liabilities	818,525	834,499	867,875
Level 2
Assets
Derivative financial instruments	3	186	6
Securitized beneficial interests	0	0	0
Total assets	3	186	6
Liabilities
Long-term debt	814,766	830,082	863,620
Guarantees	0	0	0
Total liabilities	814,766	830,082	863,620
Level 3
Assets
Derivative financial instruments	0	0	0
Securitized beneficial interests	14,648	40,332	17,736
Total assets	14,648	40,332	17,736
Liabilities
Long-term debt	623	703	711
Guarantees	3,136	3,714	3,544
Total liabilities	$ 3,759	$ 4,417	$ 4,255