Fair Value Measurements Information About Fair Value Measurements Using Significant Unobservable Inputs (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Sep. 30, 2013
Securitized Beneficial Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value of unobservable inputs	$ 35,304
Guarantees of Farmers [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Fair value of unobservable inputs	3,198
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	$ 2,825
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]
Historical Loss	4.70%
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]
Historical Loss	8.00%
Discounted Cash Flow Valuation Technique [Member] | Securitized Beneficial Interests [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis, Valuation Techniques [Line Items]
Securitized Market Rate	2.78%
Payment Speed	97 days
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]
Market Interest Rate	12.50%