Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000773141-20-000031-index-headers.html | 2020-10-29 14:48:50 | |
| 0000773141-20-000031-index.html | 2020-10-29 14:48:50 | |
| 0000773141-20-000031.txt | 2020-10-29 14:48:50 | |
 0000773141-20-000031-xbrl.zip | 303002 | 2020-10-29 14:48:50 |
| ex102-2018executiveoff.htm | 17172 | 2020-10-29 14:48:50 |
| FilingSummary.xml | 47012 | 2020-10-29 14:48:50 |
| Financial_Report.xlsx | 104455 | 2020-10-29 14:48:50 |
| mdc-20200930.htm | 2061348 | 2020-10-29 14:48:50 |
| mdc-20200930.xsd | 61526 | 2020-10-29 14:48:50 |
| mdc-20200930xex311.htm | 9585 | 2020-10-29 14:48:50 |
| mdc-20200930xex312.htm | 9511 | 2020-10-29 14:48:50 |
| mdc-20200930xex321.htm | 3601 | 2020-10-29 14:48:50 |
| mdc-20200930xex322.htm | 3378 | 2020-10-29 14:48:50 |
| mdc-20200930_cal.xml | 75469 | 2020-10-29 14:48:50 |
| mdc-20200930_def.xml | 365599 | 2020-10-29 14:48:50 |
| mdc-20200930_htm.xml | 1561879 | 2020-10-29 14:48:50 |
| mdc-20200930_lab.xml | 572418 | 2020-10-29 14:48:50 |
| mdc-20200930_pre.xml | 438424 | 2020-10-29 14:48:50 |
| MetaLinks.json | 618550 | 2020-10-29 14:48:50 |
| R1.htm | 56836 | 2020-10-29 14:48:50 |
| R10.htm | 41683 | 2020-10-29 14:48:50 |
| R11.htm | 47459 | 2020-10-29 14:48:50 |
| R12.htm | 44547 | 2020-10-29 14:48:50 |
| R13.htm | 26565 | 2020-10-29 14:48:50 |
| R14.htm | 38970 | 2020-10-29 14:48:50 |
| R15.htm | 15043 | 2020-10-29 14:48:50 |
| R16.htm | 23541 | 2020-10-29 14:48:50 |
| R17.htm | 21207 | 2020-10-29 14:48:50 |
| R18.htm | 20308 | 2020-10-29 14:48:50 |
| R19.htm | 7365 | 2020-10-29 14:48:50 |
| R2.htm | 84981 | 2020-10-29 14:48:50 |
| R20.htm | 12882 | 2020-10-29 14:48:50 |
| R21.htm | 66037 | 2020-10-29 14:48:50 |
| R22.htm | 10686 | 2020-10-29 14:48:50 |
| R23.htm | 6940 | 2020-10-29 14:48:50 |
| R24.htm | 13178 | 2020-10-29 14:48:50 |
| R25.htm | 9743 | 2020-10-29 14:48:50 |
| R26.htm | 13980 | 2020-10-29 14:48:50 |
| R27.htm | 6212 | 2020-10-29 14:48:50 |
| R28.htm | 76008 | 2020-10-29 14:48:50 |
| R29.htm | 39016 | 2020-10-29 14:48:50 |
| R3.htm | 19511 | 2020-10-29 14:48:50 |
| R30.htm | 43298 | 2020-10-29 14:48:50 |
| R31.htm | 40376 | 2020-10-29 14:48:50 |
| R32.htm | 25367 | 2020-10-29 14:48:50 |
| R33.htm | 40944 | 2020-10-29 14:48:50 |
| R34.htm | 14293 | 2020-10-29 14:48:50 |
| R35.htm | 24930 | 2020-10-29 14:48:50 |
| R36.htm | 19916 | 2020-10-29 14:48:50 |
| R37.htm | 17813 | 2020-10-29 14:48:50 |
| R38.htm | 12416 | 2020-10-29 14:48:50 |
| R39.htm | 60904 | 2020-10-29 14:48:50 |
| R4.htm | 74657 | 2020-10-29 14:48:50 |
| R40.htm | 29697 | 2020-10-29 14:48:50 |
| R41.htm | 5928 | 2020-10-29 14:48:50 |
| R42.htm | 23623 | 2020-10-29 14:48:50 |
| R43.htm | 26761 | 2020-10-29 14:48:50 |
| R44.htm | 24283 | 2020-10-29 14:48:50 |
| R45.htm | 4989 | 2020-10-29 14:48:50 |
| R46.htm | 56527 | 2020-10-29 14:48:50 |
| R47.htm | 20506 | 2020-10-29 14:48:50 |
| R48.htm | 9790 | 2020-10-29 14:48:50 |
| R49.htm | 9757 | 2020-10-29 14:48:50 |
| R5.htm | 87462 | 2020-10-29 14:48:50 |
| R50.htm | 36162 | 2020-10-29 14:48:50 |
| R51.htm | 18774 | 2020-10-29 14:48:50 |
| R52.htm | 15653 | 2020-10-29 14:48:50 |
| R53.htm | 8344 | 2020-10-29 14:48:50 |
| R54.htm | 17573 | 2020-10-29 14:48:50 |
| R55.htm | 11413 | 2020-10-29 14:48:50 |
| R56.htm | 9459 | 2020-10-29 14:48:50 |
| R57.htm | 7446 | 2020-10-29 14:48:50 |
| R58.htm | 6809 | 2020-10-29 14:48:50 |
| R59.htm | 24489 | 2020-10-29 14:48:50 |
| R6.htm | 95588 | 2020-10-29 14:48:50 |
| R60.htm | 18460 | 2020-10-29 14:48:50 |
| R61.htm | 27639 | 2020-10-29 14:48:50 |
| R62.htm | 12915 | 2020-10-29 14:48:50 |
| R63.htm | 12806 | 2020-10-29 14:48:50 |
| R64.htm | 10948 | 2020-10-29 14:48:50 |
| R65.htm | 8840 | 2020-10-29 14:48:50 |
| R66.htm | 13986 | 2020-10-29 14:48:50 |
| R67.htm | 11731 | 2020-10-29 14:48:50 |
| R68.htm | 44631 | 2020-10-29 14:48:50 |
| R69.htm | 12859 | 2020-10-29 14:48:50 |
| R7.htm | 8466 | 2020-10-29 14:48:50 |
| R70.htm | 45140 | 2020-10-29 14:48:50 |
| R71.htm | 16590 | 2020-10-29 14:48:50 |
| R72.htm | 15761 | 2020-10-29 14:48:50 |
| R73.htm | 54336 | 2020-10-29 14:48:50 |
| R74.htm | 18948 | 2020-10-29 14:48:50 |
| R75.htm | 16429 | 2020-10-29 14:48:50 |
| R8.htm | 14700 | 2020-10-29 14:48:50 |
| R9.htm | 81118 | 2020-10-29 14:48:50 |
| report.css | 2767 | 2020-10-29 14:48:50 |
| Show.js | 1085 | 2020-10-29 14:48:50 |