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| 0000768835-19-000055-index.html | 2019-06-12 16:08:55 | |
| 0000768835-19-000055.txt | 2019-06-12 16:08:55 | |
 0000768835-19-000055-xbrl.zip | 195694 | 2019-06-12 16:08:55 |
| big-20190504.xsd | 34362 | 2019-06-12 16:08:55 |
| big-20190504_cal.xml | 60501 | 2019-06-12 16:08:55 |
| big-20190504_def.xml | 294854 | 2019-06-12 16:08:55 |
| big-20190504_lab.xml | 658753 | 2019-06-12 16:08:55 |
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| big-201954x10q.htm | 990399 | 2019-06-12 16:08:55 |
| big-201954x10q_htm.xml | 765184 | 2019-06-12 16:08:55 |
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| big-201954xex322.htm | 7599 | 2019-06-12 16:08:55 |
| FilingSummary.xml | 26624 | 2019-06-12 16:08:55 |
| Financial_Report.xlsx | 53607 | 2019-06-12 16:08:55 |
| MetaLinks.json | 534239 | 2019-06-12 16:08:55 |
| R1.htm | 28010 | 2019-06-12 16:08:55 |
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| report.css | 2767 | 2019-06-12 16:08:55 |
| Show.js | 1085 | 2019-06-12 16:08:55 |