Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-26-398596-index-headers.html | 2026-09-23 08:51:44 | |
| 0001193125-26-398596-index.html | 2026-09-23 08:51:44 | |
| 0001193125-26-398596.txt | 2026-09-23 08:51:44 | |
 0001193125-26-398596-xbrl.zip | 9151 | 2026-09-23 08:51:44 |
| cik0000773757-20260922.xsd | 36511 | 2026-09-23 08:51:44 |
| d518240d497.htm | 69681 | 2026-09-23 08:51:44 |
| d518240d497_htm.xml | 21104 | 2026-09-23 08:51:44 |
| FilingSummary.xml | 2189 | 2026-09-23 08:51:44 |
| MetaLinks.json | 109733 | 2026-09-23 08:51:44 |
| R1.htm | 13994 | 2026-09-23 08:51:44 |
| R2.htm | 22325 | 2026-09-23 08:51:44 |
| report.css | 2766 | 2026-09-23 08:51:44 |
| Show.js | 1084 | 2026-09-23 08:51:44 |