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| 0000067716-23-000108.txt | 2023-11-02 08:35:07 | |
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| a2023q3ex99.htm | 574598 | 2023-11-02 08:35:07 |
| FilingSummary.xml | 1663 | 2023-11-02 08:35:07 |
| Financial_Report.xlsx | 5724 | 2023-11-02 08:35:07 |
| mdu-20231102.htm | 24326 | 2023-11-02 08:35:07 |
| mdu-20231102.xsd | 2152 | 2023-11-02 08:35:07 |
| mdu-20231102_def.xml | 14731 | 2023-11-02 08:35:07 |
| mdu-20231102_htm.xml | 2827 | 2023-11-02 08:35:07 |
| mdu-20231102_lab.xml | 28858 | 2023-11-02 08:35:07 |
| mdu-20231102_pre.xml | 15396 | 2023-11-02 08:35:07 |
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