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| 0000104889-17-000022-index.html | 2017-05-03 12:28:52 | |
| 0000104889-17-000022.txt | 2017-05-03 12:28:52 | |
 0000104889-17-000022-xbrl.zip | 302402 | 2017-05-03 12:28:52 |
| d10q.htm | 1144116 | 2017-05-03 12:28:52 |
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| FilingSummary.xml | 38538 | 2017-05-03 12:28:52 |
| Financial_Report.xlsx | 82991 | 2017-05-03 12:28:52 |
| ghc-20170331.xml | 2186347 | 2017-05-03 12:28:52 |
| ghc-20170331.xsd | 73566 | 2017-05-03 12:28:52 |
| ghc-20170331_cal.xml | 150474 | 2017-05-03 12:28:52 |
| ghc-20170331_def.xml | 494473 | 2017-05-03 12:28:52 |
| ghc-20170331_lab.xml | 997913 | 2017-05-03 12:28:52 |
| ghc-20170331_pre.xml | 651257 | 2017-05-03 12:28:52 |
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| report.css | 2767 | 2017-05-03 12:28:52 |
| Show.js | 1410 | 2017-05-03 12:28:52 |