XML 57 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Derivatives (Interest rate swap agreements) (Details) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2017 USD ($)
Swap Agreement Three [Member] |
Swaps: |
Original variable, rate debt amount | $ 300.0
Agreement date | Aug. 16, 2006
Effective date | Aug. 18, 2006
Expiration date | Aug. 10, 2018
Designed cash flow hedge date | Aug. 04, 2006
Swap Agreement Twelve [Member] |
Swaps: |
Original variable, rate debt amount | $ 25.0
Agreement date | Apr. 26, 2011
Effective date | Jun. 01, 2011
Expiration date | Jun. 01, 2018
Designed cash flow hedge date | Jun. 01, 2011
Swap Agreement Thirteen [Member] |
Swaps: |
Original variable, rate debt amount | $ 50.0
Agreement date | Jul. 29, 2011
Effective date | Aug. 15, 2011
Expiration date | Aug. 15, 2018
Designed cash flow hedge date | Jul. 29, 2011
Swap Agreement Fourteen [Member] |
Swaps: |
Original variable, rate debt amount | $ 20.0
Agreement date | Aug. 03, 2011
Effective date | Sep. 12, 2011
Expiration date | Sep. 10, 2018
Designed cash flow hedge date | Aug. 03, 2011
Swap Agreement Fifteen [Member] |
Swaps: |
Original variable, rate debt amount | $ 15.1
Agreement date | Mar. 27, 2012
Effective date | Mar. 28, 2012
Expiration date | Mar. 28, 2019
Designed cash flow hedge date | Mar. 26, 2012
Swap Agreement Sixteen [Member] |
Swaps: |
Original variable, rate debt amount | $ 25.0
Agreement date | Apr. 13, 2012
Effective date | Apr. 16, 2012
Expiration date | Apr. 01, 2019
Designed cash flow hedge date | Apr. 12, 2012
Swap Agreement Seventeen [Member] |
Swaps: |
Original variable, rate debt amount | $ 44.3
Agreement date | Jan. 11, 2013
Effective date | Jan. 15, 2013
Expiration date | Dec. 15, 2019
Designed cash flow hedge date | Jan. 11, 2013

X
- Definition The date the derivative agreement becomes effective. This date differs from the agreement date. + References No definition available. + Details
Name: | uhal_DerivativeEffectiveDate
Namespace Prefix: | uhal_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative is designated as a cash flow hedge. + References No definition available. + Details
Name: | uhal_DesignatedCashFlowHedgeDate
Namespace Prefix: | uhal_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeInceptionDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_DerivativeMaturityDates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InterestRateDerivativesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementFourteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementFifteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementSixteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=uhal_SwapAgreementSeventeenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |