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| 0001408075-23-000021-index.html | 2023-05-02 15:54:36 | |
| 0001408075-23-000021.txt | 2023-05-02 15:54:36 | |
 0001408075-23-000021-xbrl.zip | 256829 | 2023-05-02 15:54:36 |
| FilingSummary.xml | 39202 | 2023-05-02 15:54:36 |
| Financial_Report.xlsx | 94146 | 2023-05-02 15:54:36 |
| gpk-20230331.htm | 1197012 | 2023-05-02 15:54:36 |
| gpk-20230331.xsd | 47695 | 2023-05-02 15:54:36 |
| gpk-20230331_cal.xml | 82302 | 2023-05-02 15:54:36 |
| gpk-20230331_def.xml | 259122 | 2023-05-02 15:54:36 |
| gpk-20230331_htm.xml | 1009212 | 2023-05-02 15:54:36 |
| gpk-20230331_lab.xml | 630937 | 2023-05-02 15:54:36 |
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| gpk03312023ex311.htm | 9721 | 2023-05-02 15:54:36 |
| gpk03312023ex312.htm | 9727 | 2023-05-02 15:54:36 |
| gpk03312023ex321.htm | 3753 | 2023-05-02 15:54:36 |
| gpk03312023ex322.htm | 3949 | 2023-05-02 15:54:36 |
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| q12023exhibit101.htm | 18349 | 2023-05-02 15:54:36 |
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| report.css | 2767 | 2023-05-02 15:54:36 |
| Show.js | 1085 | 2023-05-02 15:54:36 |