Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
	Apr. 30, 2019	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021	Mar. 31, 2019
Financial assets:
Other investments		$ 18,000	$ 0	$ 0
Carrying Value
Financial assets:
Other investments		18,000
Estimated Fair Value
Financial assets:
Other investments		18,000
Estimated Fair Value | Level 1
Financial assets:
Other investments		0
Estimated Fair Value | Level 2
Financial assets:
Other investments		0
Estimated Fair Value | Level 3
Financial assets:
Other investments		$ 18,000
2.89% promissory note receivable due April 2024
Financial assets:
Notes receivable, fair value	$ 1,100				$ 1,100
Financial liabilities:
Interest on note receivable	2.89%	2.89%	2.89%	2.89%
2.89% promissory note receivable due April 2024 | Carrying Value
Financial assets:
Notes receivable, fair value		$ 1,198	$ 1,164	$ 1,181
2.89% promissory note receivable due April 2024 | Estimated Fair Value
Financial assets:
Notes receivable, fair value		1,198	1,164	1,181
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 1
Financial assets:
Notes receivable, fair value		0	0	0
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 2
Financial assets:
Notes receivable, fair value		0	0	0
2.89% promissory note receivable due April 2024 | Estimated Fair Value | Level 3
Financial assets:
Notes receivable, fair value		1,198	1,164	1,181
Investments in unconsolidated affiliates | Carrying Value
Financial assets:
Investments in unconsolidated affiliates		42,002	34,961	37,724
Investments in unconsolidated affiliates | Estimated Fair Value
Financial assets:
Investments in unconsolidated affiliates		51,502	45,581	48,954
Investments in unconsolidated affiliates | Estimated Fair Value | Level 1
Financial assets:
Investments in unconsolidated affiliates		44,529	37,984	41,638
Investments in unconsolidated affiliates | Estimated Fair Value | Level 2
Financial assets:
Investments in unconsolidated affiliates		0	0	0
Investments in unconsolidated affiliates | Estimated Fair Value | Level 3
Financial assets:
Investments in unconsolidated affiliates		6,973	7,597	7,316
2024 Convertible Notes | Carrying Value
Financial liabilities:
Debt instruments, fair value		142,248	120,307	123,543
2024 Convertible Notes | Estimated Fair Value
Financial liabilities:
Debt instruments, fair value		141,594	132,609	153,281
2024 Convertible Notes | Estimated Fair Value | Level 1
Financial liabilities:
Debt instruments, fair value		0	0	0
2024 Convertible Notes | Estimated Fair Value | Level 2
Financial liabilities:
Debt instruments, fair value		141,594	132,609	153,281
2024 Convertible Notes | Estimated Fair Value | Level 3
Financial liabilities:
Debt instruments, fair value		0	0	0
2025 Convertible Notes | Carrying Value
Financial liabilities:
Debt instruments, fair value		169,920	136,836	140,643
2025 Convertible Notes | Estimated Fair Value
Financial liabilities:
Debt instruments, fair value		153,525	143,175	155,250
2025 Convertible Notes | Estimated Fair Value | Level 1
Financial liabilities:
Debt instruments, fair value		0	0	0
2025 Convertible Notes | Estimated Fair Value | Level 2
Financial liabilities:
Debt instruments, fair value		153,525	143,175	155,250
2025 Convertible Notes | Estimated Fair Value | Level 3
Financial liabilities:
Debt instruments, fair value		$ 0	$ 0	$ 0