Fair Value Measurements - Information about Fair Value Measurements using Significant Unobservable Inputs (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Discounted Cash Flow | Securitized Beneficial Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value of unobservable inputs of asset	$ 28,072	$ 19,370
Discounted Cash Flow | Minimum | Securitized Beneficial Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Securitized market rate (as a percent)	2.80%	1.30%
Payment speed period	91 days	57 days
Discounted Cash Flow | Maximum | Securitized Beneficial Interests
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Securitized market rate (as a percent)	3.90%	3.60%
Payment speed period	103 days	77 days
Historical Loss | Guarantees of Farmers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value of unobservable inputs of asset	$ 2,956	$ 1,740
Historical Loss | Minimum | Guarantees of Farmers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Historical loss rate (as a percent)	0.60%	0.10%
Historical Loss | Maximum | Guarantees of Farmers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Historical loss rate (as a percent)	44.60%	45.20%
Discounted Future Payments | Long-Term Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value of unobservable inputs of liability	$ 246	$ 3,162
Discounted Future Payments | Minimum | Treasury Notes Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Measurement input of long-term debt (as a percent)		0.009
Discounted Future Payments | Minimum | Borrowing Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Measurement input of long-term debt (as a percent)	0.070	0.070
Discounted Future Payments | Maximum | Treasury Notes Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Measurement input of long-term debt (as a percent)	0.025	0.016
Discounted Future Payments | Maximum | Borrowing Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Measurement input of long-term debt (as a percent)	0.105	0.107