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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) (USD $)	Dec. 31, 2014	Mar. 31, 2014
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables
Line of credit
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables
Line of credit	130,000,000us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	127,900,000us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables	282,845,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	269,344,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Line of credit
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables	282,845,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	269,344,000us-gaap_NotesReceivableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Line of credit	$ 130,000,000us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	$ 127,900,000us-gaap_LinesOfCreditFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Line-of-Credit Arrangement

-URI http://asc.fasb.org/extlink&oid=6517033

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- Definition

Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph b

-Article 5

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