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| 0000909832-19-000033.txt | 2019-12-20 18:04:39 | |
 0000909832-19-000033-xbrl.zip | 211572 | 2019-12-20 18:04:39 |
| cost-20191124.xsd | 33688 | 2019-12-20 18:04:39 |
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| cost10q112419.htm | 1106018 | 2019-12-20 18:04:39 |
| cost10q112419_htm.xml | 817171 | 2019-12-20 18:04:39 |
| costex1021112419.htm | 29539 | 2019-12-20 18:04:39 |
| costex1022112419.htm | 50469 | 2019-12-20 18:04:39 |
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| costex1024112419.htm | 7946 | 2019-12-20 18:04:39 |
| costex103112419.htm | 7647 | 2019-12-20 18:04:39 |
| costex31110q112419.htm | 23892 | 2019-12-20 18:04:39 |
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| costex41112419.htm | 19239 | 2019-12-20 18:04:39 |
| FilingSummary.xml | 26090 | 2019-12-20 18:04:39 |
| Financial_Report.xlsx | 51664 | 2019-12-20 18:04:39 |
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| R1.htm | 52196 | 2019-12-20 18:04:39 |
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| report.css | 2767 | 2019-12-20 18:04:39 |
| Show.js | 1085 | 2019-12-20 18:04:39 |