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| 0001408075-16-000064-index.html | 2016-04-28 11:12:22 | |
| 0001408075-16-000064.txt | 2016-04-28 11:12:22 | |
 0001408075-16-000064-xbrl.zip | 213115 | 2016-04-28 11:12:22 |
| a2ndamendgpisavings1-1x2015.htm | 19155 | 2016-04-28 11:12:22 |
| a3rdamendgpisavingsplan.htm | 12962 | 2016-04-28 11:12:22 |
| a4thamendgpisavingsplan.htm | 17592 | 2016-04-28 11:12:22 |
| a4thamendgpklgretirementpl.htm | 24516 | 2016-04-28 11:12:22 |
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| Financial_Report.xlsx | 73862 | 2016-04-28 11:12:22 |
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| gpk-20160331.xsd | 43144 | 2016-04-28 11:12:22 |
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| gpk-20160331_lab.xml | 564448 | 2016-04-28 11:12:22 |
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| report.css | 2767 | 2016-04-28 11:12:22 |
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