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v3.21.1

Long-Term Debt (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 11, 2020 USD ($) | Mar. 27, 2021 USD ($) entity | Mar. 28, 2020 USD ($)
Debt Instrument [Line Items] |  |  |
Fair value of long-term debt (including current portion) |  | $ 190,000,000.0 | $ 566,400,000
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility term |  | 5 years |
Revolving credit facility agreement |  | $ 600,000,000 |
Revolving credit facility agreement, number of participating banks | entity |  | 8 |
Credit Facility Increased Availability |  | $ 250,000,000 |
Amount outstanding under Credit Facility |  | 190,000,000.0 |
Net availability under the credit facility |  | $ 376,400,000 |
Revolving Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate at period end over LIBOR |  | 2.25% | 1.00%
First Amendment To Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Allowable dividend or distribution | $ 38,500,000 |  |
Allowable acquisitions | $ 100,000,000 |  |
Standby Letters of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility agreement |  | $ 80,000,000 |
Amount outstanding under Credit Facility |  | $ 33,600,000 |
Minimum [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of fees on amount available |  | 0.125% |
Minimum [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate over LIBOR on the facility |  | 0.75% |
Minimum [Member] | First Amendment To Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.75% |  |
Minimum [Member] | First Amendment To Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate spread during debt covenant relief period | 2.25% |  |
Minimum [Member] | Standby Letters of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of fees on amount available |  | 0.875% |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of fees on amount available |  | 0.35% |
Maximum [Member] | Revolving Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate over LIBOR on the facility |  | 2.00% |
Maximum [Member] | Standby Letters of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of fees on amount available |  | 2.125% |

X
- Definition Debt instrument, Allowable acquisitions cost in next year + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Debt instrument, Allowable dividend or distribution in next year + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument during the debt covenant relief period. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line of Credit Facility, Interest Rate at Period End, Variable Spread + References No definition available. + Details
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Namespace Prefix: | mnro_
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- Definition Revolving credit facility agreement, number of participating banks. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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