Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000104889-21-000029-index-headers.html | 2021-05-05 08:32:56 | |
| 0000104889-21-000029-index.html | 2021-05-05 08:32:56 | |
| 0000104889-21-000029.txt | 2021-05-05 08:32:56 | |
 0000104889-21-000029-xbrl.zip | 31185 | 2021-05-05 08:32:56 |
| a2021q18-kexhibit991.htm | 360997 | 2021-05-05 08:32:56 |
| FilingSummary.xml | 1721 | 2021-05-05 08:32:56 |
| Financial_Report.xlsx | 5678 | 2021-05-05 08:32:56 |
| ghc-20210505.htm | 41187 | 2021-05-05 08:32:56 |
| ghc-20210505.xsd | 2419 | 2021-05-05 08:32:56 |
| ghc-20210505_cal.xml | 713 | 2021-05-05 08:32:56 |
| ghc-20210505_def.xml | 1650 | 2021-05-05 08:32:56 |
| ghc-20210505_htm.xml | 11261 | 2021-05-05 08:32:56 |
| ghc-20210505_lab.xml | 24275 | 2021-05-05 08:32:56 |
| ghc-20210505_pre.xml | 12649 | 2021-05-05 08:32:56 |
| MetaLinks.json | 17251 | 2021-05-05 08:32:56 |
| R1.htm | 38624 | 2021-05-05 08:32:56 |
| report.css | 2767 | 2021-05-05 08:32:56 |
| Show.js | 1085 | 2021-05-05 08:32:56 |