Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000067716-17-000087-index-headers.html | 2017-11-03 09:20:26 | |
| 0000067716-17-000087-index.html | 2017-11-03 09:20:26 | |
| 0000067716-17-000087.txt | 2017-11-03 09:20:26 | |
 0000067716-17-000087-xbrl.zip | 327497 | 2017-11-03 09:20:26 |
| a2017q3ex10a.htm | 13836 | 2017-11-03 09:20:26 |
| a2017q3ex10b.htm | 27887 | 2017-11-03 09:20:26 |
| a2017q3ex12.htm | 36695 | 2017-11-03 09:20:26 |
| a2017q3ex31a.htm | 9819 | 2017-11-03 09:20:26 |
| a2017q3ex31b.htm | 9250 | 2017-11-03 09:20:26 |
| a2017q3ex32.htm | 6477 | 2017-11-03 09:20:26 |
| a2017q3ex95.htm | 90878 | 2017-11-03 09:20:26 |
| a2017q3form10-q.htm | 2355855 | 2017-11-03 09:20:26 |
| a2017q3form10-q_htm.xml | 2396541 | 2017-11-03 09:20:26 |
| FilingSummary.xml | 45011 | 2017-11-03 09:20:26 |
| Financial_Report.xlsx | 99075 | 2017-11-03 09:20:26 |
| mdu-20170930.xsd | 58848 | 2017-11-03 09:20:26 |
| mdu-20170930_cal.xml | 124932 | 2017-11-03 09:20:26 |
| mdu-20170930_def.xml | 444899 | 2017-11-03 09:20:26 |
| mdu-20170930_lab.xml | 782426 | 2017-11-03 09:20:26 |
| mdu-20170930_pre.xml | 531141 | 2017-11-03 09:20:26 |
| MetaLinks.json | 675262 | 2017-11-03 09:20:26 |
| R1.htm | 20518 | 2017-11-03 09:20:26 |
| R10.htm | 7452 | 2017-11-03 09:20:26 |
| R11.htm | 21904 | 2017-11-03 09:20:26 |
| R12.htm | 18599 | 2017-11-03 09:20:26 |
| R13.htm | 20221 | 2017-11-03 09:20:26 |
| R14.htm | 127930 | 2017-11-03 09:20:26 |
| R15.htm | 145721 | 2017-11-03 09:20:26 |
| R16.htm | 79278 | 2017-11-03 09:20:26 |
| R17.htm | 120212 | 2017-11-03 09:20:26 |
| R18.htm | 36856 | 2017-11-03 09:20:26 |
| R19.htm | 19448 | 2017-11-03 09:20:26 |
| R2.htm | 89365 | 2017-11-03 09:20:26 |
| R20.htm | 118380 | 2017-11-03 09:20:26 |
| R21.htm | 57331 | 2017-11-03 09:20:26 |
| R22.htm | 26238 | 2017-11-03 09:20:26 |
| R23.htm | 35659 | 2017-11-03 09:20:26 |
| R24.htm | 6226 | 2017-11-03 09:20:26 |
| R25.htm | 5524 | 2017-11-03 09:20:26 |
| R26.htm | 5806 | 2017-11-03 09:20:26 |
| R27.htm | 5953 | 2017-11-03 09:20:26 |
| R28.htm | 20013 | 2017-11-03 09:20:26 |
| R29.htm | 9400 | 2017-11-03 09:20:26 |
| R3.htm | 46348 | 2017-11-03 09:20:26 |
| R30.htm | 4536 | 2017-11-03 09:20:26 |
| R31.htm | 10115 | 2017-11-03 09:20:26 |
| R32.htm | 20759 | 2017-11-03 09:20:26 |
| R33.htm | 17843 | 2017-11-03 09:20:26 |
| R34.htm | 128897 | 2017-11-03 09:20:26 |
| R35.htm | 136588 | 2017-11-03 09:20:26 |
| R36.htm | 75401 | 2017-11-03 09:20:26 |
| R37.htm | 117812 | 2017-11-03 09:20:26 |
| R38.htm | 35677 | 2017-11-03 09:20:26 |
| R39.htm | 18571 | 2017-11-03 09:20:26 |
| R4.htm | 16765 | 2017-11-03 09:20:26 |
| R40.htm | 113773 | 2017-11-03 09:20:26 |
| R41.htm | 54299 | 2017-11-03 09:20:26 |
| R42.htm | 6900 | 2017-11-03 09:20:26 |
| R43.htm | 19139 | 2017-11-03 09:20:26 |
| R44.htm | 12228 | 2017-11-03 09:20:26 |
| R45.htm | 8738 | 2017-11-03 09:20:26 |
| R46.htm | 39192 | 2017-11-03 09:20:26 |
| R47.htm | 34281 | 2017-11-03 09:20:26 |
| R48.htm | 8607 | 2017-11-03 09:20:26 |
| R49.htm | 29793 | 2017-11-03 09:20:26 |
| R5.htm | 110887 | 2017-11-03 09:20:26 |
| R50.htm | 15232 | 2017-11-03 09:20:26 |
| R51.htm | 79210 | 2017-11-03 09:20:26 |
| R52.htm | 12716 | 2017-11-03 09:20:26 |
| R53.htm | 14123 | 2017-11-03 09:20:26 |
| R54.htm | 18848 | 2017-11-03 09:20:26 |
| R55.htm | 47839 | 2017-11-03 09:20:26 |
| R56.htm | 28537 | 2017-11-03 09:20:26 |
| R57.htm | 38010 | 2017-11-03 09:20:26 |
| R58.htm | 7696 | 2017-11-03 09:20:26 |
| R59.htm | 18287 | 2017-11-03 09:20:26 |
| R6.htm | 11170 | 2017-11-03 09:20:26 |
| R60.htm | 65324 | 2017-11-03 09:20:26 |
| R61.htm | 10938 | 2017-11-03 09:20:26 |
| R62.htm | 28925 | 2017-11-03 09:20:26 |
| R63.htm | 5933 | 2017-11-03 09:20:26 |
| R64.htm | 48637 | 2017-11-03 09:20:26 |
| R65.htm | 14271 | 2017-11-03 09:20:26 |
| R66.htm | 55571 | 2017-11-03 09:20:26 |
| R67.htm | 36977 | 2017-11-03 09:20:26 |
| R68.htm | 16251 | 2017-11-03 09:20:26 |
| R69.htm | 9913 | 2017-11-03 09:20:26 |
| R7.htm | 86429 | 2017-11-03 09:20:26 |
| R70.htm | 16908 | 2017-11-03 09:20:26 |
| R71.htm | 50621 | 2017-11-03 09:20:26 |
| R72.htm | 8135 | 2017-11-03 09:20:26 |
| R73.htm | 11570 | 2017-11-03 09:20:26 |
| R74.htm | 8121 | 2017-11-03 09:20:26 |
| R75.htm | 9323 | 2017-11-03 09:20:26 |
| R76.htm | 32600 | 2017-11-03 09:20:26 |
| R77.htm | 27535 | 2017-11-03 09:20:26 |
| R78.htm | 6354 | 2017-11-03 09:20:26 |
| R8.htm | 7193 | 2017-11-03 09:20:26 |
| R9.htm | 5270 | 2017-11-03 09:20:26 |
| report.css | 2767 | 2017-11-03 09:20:26 |
| Show.js | 1410 | 2017-11-03 09:20:26 |