Schedule II - Amerco and Consolidated Subsidiaries Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2022
Disclosure Text Block [Abstract]
Schedule Of Valuation And Qualifying Accounts Disclosure [Text Block]	SCHEDULE II AMERCO AND CONSOLIDATED SUBSIDIARIES VALUATION AND QUALIFYING ACCOUNTS       Balance at Beginning of Year   Additions Charged to Costs and Expenses   Additions Charged to Other Accounts   Deductions   Balance at Year End                       Year ended March 31, 2022   (In thousands) Allowance for credit losses                     (deducted from trade receivable) $ 4,421 $ 5,283 $ 1,679 $ (2,734) $ 8,649 Allowance for obsolescence                     (deducted from inventory) $ 1,416 $ – $ – $ (336) $ 1,080 Allowance for LIFO                     (deducted from inventory) $ 21,832 $ 15,568 $ – $ – $ 37,400 Allowance for probable losses                     (deducted from mortgage loans) $ 448 $ – $ – $ – $ 448                       Year ended March 31, 2021     Allowance for credit losses                     (deducted from trade receivable) $ 535 $ 2,179 $ 2,680 $ (973) $ 4,421 Allowance for obsolescence                     (deducted from inventory) $ 3,063 $ – $ – $ (1,647) $ 1,416 Allowance for LIFO                     (deducted from inventory) $ 18,886 $ 2,946 $ – $ – $ 21,832 Allowance for probable losses                     (deducted from mortgage loans) $ 493 $ – $ – $ (45) $ 448                       Year ended March 31, 2020                     Allowance for doubtful accounts                     (deducted from trade receivable) $ 549 $ 731 $ – $ (745) $ 535 Allowance for obsolescence                     (deducted from inventory) $ 2,322 $ 741 $ – $ – $ 3,063 Allowance for LIFO                     (deducted from inventory) $ 18,987 $ – $ – $ (101) $ 18,886 Allowance for probable losses                     (deducted from mortgage loans)$ 493 $ – $ – $ – $ 493