Fair Value Measurements Information About Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Securitized Beneficial Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value of Unobservable Inputs	$ 40,712	$ 35,559
Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value of Unobservable Inputs	3,110	1,211
Guarantees of Unconsolidated Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value of Unobservable Inputs	$ 2,128	$ 1,976
Historical Loss Valuation Technique [Member] | Minimum [Member] | Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Historical Loss	10.00%	6.00%
Historical Loss Valuation Technique [Member] | Maximum [Member] | Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Historical Loss	15.80%	8.00%
Discounted Cash Flow Valuation Technique [Member] | Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair Value of Unobservable Inputs	$ 3,412	$ 4,157
Discounted Cash Flow Valuation Technique [Member] | Guarantees of Unconsolidated Subsidiary [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Market Interest Rate	12.00%	12.00%
Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Securitized Beneficial Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Securitized Market Rate	2.73%	2.74%
Unobservable Input, Payment Speed	116 days	62 days 2 hours 24 minutes
Discounted Cash Flow Valuation Technique [Member] | Minimum [Member] | Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Historical Loss	13.00%
Unobservable Input, Market Interest Rate		10.00%
Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Securitized Beneficial Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Securitized Market Rate	2.74%	3.86%
Unobservable Input, Payment Speed	119 days 9 hours 36 minutes	105 days 2 hours 24 minutes
Discounted Cash Flow Valuation Technique [Member] | Maximum [Member] | Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Unobservable Input, Historical Loss	22.00%
Unobservable Input, Market Interest Rate		46.00%