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| 0000067716-24-000009-index.html | 2024-02-08 08:33:42 | |
| 0000067716-24-000009.txt | 2024-02-08 08:33:42 | |
 0000067716-24-000009-xbrl.zip | 43007 | 2024-02-08 08:33:42 |
| a2023earningsreleaseex-99.htm | 627973 | 2024-02-08 08:33:42 |
| FilingSummary.xml | 1665 | 2024-02-08 08:33:42 |
| Financial_Report.xlsx | 5725 | 2024-02-08 08:33:42 |
| mdu-20240208.htm | 24755 | 2024-02-08 08:33:42 |
| mdu-20240208.xsd | 2152 | 2024-02-08 08:33:42 |
| mdu-20240208_def.xml | 14731 | 2024-02-08 08:33:42 |
| mdu-20240208_htm.xml | 2827 | 2024-02-08 08:33:42 |
| mdu-20240208_lab.xml | 28858 | 2024-02-08 08:33:42 |
| mdu-20240208_pre.xml | 15396 | 2024-02-08 08:33:42 |
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| R1.htm | 39860 | 2024-02-08 08:33:42 |
| report.css | 2767 | 2024-02-08 08:33:42 |
| Show.js | 1085 | 2024-02-08 08:33:42 |