Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000898430-25-000051-index-headers.html | 2025-01-03 13:24:19 | |
| 0000898430-25-000051-index.html | 2025-01-03 13:24:19 | |
| 0000898430-25-000051.txt | 2025-01-03 13:24:19 | |
 0000898430-25-000051-xbrl.zip | 805486 | 2025-01-03 13:24:19 |
| 302_Certification.htm | 33676 | 2025-01-03 13:24:19 |
| 8dd259283674783.htm | 3904424 | 2025-01-03 13:24:19 |
| 8dd259283674783_htm.xml | 331620 | 2025-01-03 13:24:19 |
| 906_Certification.htm | 10284 | 2025-01-03 13:24:19 |
 chartimages_3428897.jpg | 34279 | 2025-01-03 13:24:19 |
 chartimages_3428911.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3428926.jpg | 34279 | 2025-01-03 13:24:19 |
 chartimages_3428933.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3428946.jpg | 34279 | 2025-01-03 13:24:19 |
 chartimages_3428953.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3428966.jpg | 34279 | 2025-01-03 13:24:19 |
 chartimages_3428973.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3428974.jpg | 34279 | 2025-01-03 13:24:19 |
 chartimages_3428981.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3429010.jpg | 41087 | 2025-01-03 13:24:19 |
 chartimages_3429014.jpg | 34279 | 2025-01-03 13:24:19 |
| cik0000773757-20241031.xsd | 10501 | 2025-01-03 13:24:19 |
| cik0000773757-20241031_def.xml | 14905 | 2025-01-03 13:24:19 |
| cik0000773757-20241031_lab.xml | 25286 | 2025-01-03 13:24:19 |
| cik0000773757-20241031_pre.xml | 17556 | 2025-01-03 13:24:19 |
| FilingSummary.xml | 3609 | 2025-01-03 13:24:19 |
| Financial_Report.xlsx | 15261 | 2025-01-03 13:24:19 |
 images_1849.jpg | 24911 | 2025-01-03 13:24:19 |
 images_1855.jpg | 109128 | 2025-01-03 13:24:19 |
 img1947bdf01.jpg | 250062 | 2025-01-03 13:24:19 |
 imge16d193b2.jpg | 38453 | 2025-01-03 13:24:19 |
| MetaLinks.json | 90656 | 2025-01-03 13:24:19 |
| R1.htm | 12734 | 2025-01-03 13:24:19 |
| R2.htm | 256940 | 2025-01-03 13:24:19 |
| R3.htm | 141324 | 2025-01-03 13:24:19 |
| report.css | 2767 | 2025-01-03 13:24:19 |
| Show.js | 1085 | 2025-01-03 13:24:19 |