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Stock Ownership (Narrative) (Details) - $ / shares | 12 Months Ended |
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Mar. 30, 2019 | Mar. 31, 2018
Stock Ownership [Abstract] |  |
Class C convertible preferred stock, conversion value | $ 0.064 | $ 0.064
Distribution amount per share of preferred stock on liquidation of company | $ 1.50 |
Minimum percentage of preferred stock holders approval for authorization of action | 60.00% |

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- Definition Distribution amount per share of preferred stock on liquidation of company. + References No definition available. + Details
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Period Type: | instant

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- Definition Minimum percentage of preferred stock holders approval for authorization of action. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition The rate at which the preferred stock can be converted into common stock. + References No definition available. + Details
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Namespace Prefix: | mnro_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Stock Ownership. + References No definition available. + Details
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