This extended concept combines two main concepts on the US-GAAP taxonomy. (1) SupplementalScheduleOfReinsurancePremiumsForInsuranceCompaniesTextBlock,Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]: "The entire disclosure for the supplemental schedule of reinsurance information required to be filed for each period for which an audited income statement is presented. Reinsurance schedule includes the type of insurance, gross amount of premiums, premiums ceded to other companies, premiums assumed from other companies, net amount of premium revenue, and the percentage of the premiums assumed to net premium revenue." (2) ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock, Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]: "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables."

No definition available.

Name:	uhal_ReinsuranceRecoverablesAndTradeReceivablesNetTableTextBlock
Namespace Prefix:	uhal_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration