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| 0000067716-23-000006-index.html | 2023-02-09 08:30:03 | |
| 0000067716-23-000006.txt | 2023-02-09 08:30:03 | |
 0000067716-23-000006-xbrl.zip | 45700 | 2023-02-09 08:30:03 |
| a2022earningsreleaseex-99.htm | 702242 | 2023-02-09 08:30:03 |
| FilingSummary.xml | 1693 | 2023-02-09 08:30:03 |
| Financial_Report.xlsx | 5723 | 2023-02-09 08:30:03 |
| mdu-20230209.htm | 31407 | 2023-02-09 08:30:03 |
| mdu-20230209.xsd | 2150 | 2023-02-09 08:30:03 |
| mdu-20230209_def.xml | 14778 | 2023-02-09 08:30:03 |
| mdu-20230209_htm.xml | 11289 | 2023-02-09 08:30:03 |
| mdu-20230209_lab.xml | 28856 | 2023-02-09 08:30:03 |
| mdu-20230209_pre.xml | 15394 | 2023-02-09 08:30:03 |
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| R1.htm | 39858 | 2023-02-09 08:30:03 |
| report.css | 2767 | 2023-02-09 08:30:03 |
| Show.js | 1085 | 2023-02-09 08:30:03 |