Fair Value Measurements - Input Hierarchy of Items Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Total Assets / Liabilities at Fair Value
Financial Assets:
Derivative financial instruments	$ 0	$ 0	$ 3
Securitized beneficial interests	14,949	27,021	14,648
Total assets	14,949	27,021	14,651
Financial Liabilities:
Long-term debt	321,864	359,630	815,389
Guarantees	3,312	2,791	3,136
Total liabilities	325,176	362,421	818,525
Level 2
Financial Assets:
Derivative financial instruments	0	0	3
Securitized beneficial interests	0	0	0
Total assets	0	0	3
Financial Liabilities:
Long-term debt	318,060	358,782	814,766
Guarantees	0	0	0
Total liabilities	318,060	358,782	814,766
Level 3
Financial Assets:
Derivative financial instruments	0	0	0
Securitized beneficial interests	14,949	27,021	14,648
Total assets	14,949	27,021	14,648
Financial Liabilities:
Long-term debt	3,804	848	623
Guarantees	3,312	2,791	3,136
Total liabilities	$ 7,116	$ 3,639	$ 3,759