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Borrowings (Long-term Debt Borrowings) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021
Debt instrument, maturities: |  |
Debt Instrument Carrying Amount | $ 5,196,104 | $ 4,449,691
Notes, loans and finance/capital leases payable | 5,431,361 | 4,698,615
Less: Debt issuance costs | (33,505) | (29,708)
Total notes, loans and finance/capital leases payable, net | $ 5,397,856 | 4,668,907
Real estate loan (amortizing term) [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year | 2023 |
Debt Instrument Carrying Amount | $ 51,925 | 82,913
Real estate loan (amortizing term) [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.61% |
Senior Mortgages [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2022 |
Debt instrument, maturity year range, end | 2042 |
Debt Instrument Carrying Amount | $ 2,199,110 | 2,125,324
Senior Mortgages [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 2.70% |
Senior Mortgages [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 5.50% |
Real estate loans (revolving credit) [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year | 2025 |
Debt instrument, maturity year range, start | 2023 |
Debt Instrument Carrying Amount | $ 535,000 | 535,000
Real estate loans (revolving credit) [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.34% |
Real estate loans (revolving credit) [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 3.14% |
Fleet loans (amortizing term) [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2022 |
Debt instrument, maturity year range, end | 2028 |
Debt Instrument Carrying Amount | $ 136,790 | 176,295
Fleet loans (amortizing term) [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.61% |
Fleet loans (amortizing term) [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 4.66% |
Fleet loans (revolving credit) [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2024 |
Debt instrument, maturity year range, end | 2026 |
Debt Instrument Carrying Amount | $ 550,000 | 535,000
Fleet loans (revolving credit) [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.25% |
Fleet loans (revolving credit) [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 2.36% |
Capital Leases (rental equipment) [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2022 |
Debt instrument, maturity year range, end | 2026 |
Debt Instrument Carrying Amount | $ 384,505 | 513,623
Capital Leases (rental equipment) [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.92% |
Capital Leases (rental equipment) [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 5.04% |
Finance capital lease [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year | 2029 |
Debt instrument, maturity year range, start | 2024 |
Debt Instrument Carrying Amount | $ 886,254 | 644,375
Finance capital lease [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.60% |
Finance capital lease [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 4.22% |
Private Placement [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2029 |
Debt instrument, maturity year range, end | 2033 |
Debt Instrument Carrying Amount | $ 600,000 | 0
Private Placement [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 2.43% |
Private Placement [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 2.78% |
Other Obligations [Member] |  |
Debt instrument, maturities: |  |
Debt instrument, maturity year range, start | 2022 |
Debt instrument, maturity year range, end | 2049 |
Debt Instrument Carrying Amount | $ 87,777 | $ 86,085
Other Obligations [Member] | Minimum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 1.50% |
Other Obligations [Member] | Maximum [Member] |  |
Debt instruments, interest rate, stated percentage: |  |
Debt instrument, interest rate, stated percentage | 8.00% |

X
- Definition The latest maturity year for these debt instruments. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The earliest maturity year for these debt instruments. + References No definition available. + Details
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Namespace Prefix: | uhal_
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Balance Type: | na
Period Type: | duration

X
- Definition The DebtInstrumentMaturityDate could have worked for this element, but it must include the format Month-Date-Year. Will use this US-GAAP Element in the next few schedules, when possible, where we break down the various items that make up the Borrowing's narrative. + References No definition available. + Details
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X
- Definition Amount of accumulated amortization of debt issuance costs classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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