Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000768835-19-000084-index-headers.html | 2019-12-11 16:09:52 | |
| 0000768835-19-000084-index.html | 2019-12-11 16:09:52 | |
| 0000768835-19-000084.txt | 2019-12-11 16:09:52 | |
 0000768835-19-000084-xbrl.zip | 230805 | 2019-12-11 16:09:52 |
| big-20191102.xsd | 38213 | 2019-12-11 16:09:52 |
| big-20191102_cal.xml | 78743 | 2019-12-11 16:09:52 |
| big-20191102_def.xml | 317989 | 2019-12-11 16:09:52 |
| big-20191102_lab.xml | 720636 | 2019-12-11 16:09:52 |
| big-20191102_pre.xml | 420242 | 2019-12-11 16:09:52 |
| big-2019112x10q.htm | 1375274 | 2019-12-11 16:09:52 |
| big-2019112x10q_htm.xml | 1110525 | 2019-12-11 16:09:52 |
| big-2019112xex311.htm | 14507 | 2019-12-11 16:09:52 |
| big-2019112xex312.htm | 15033 | 2019-12-11 16:09:52 |
| big-2019112xex321.htm | 7097 | 2019-12-11 16:09:52 |
| big-2019112xex322.htm | 7630 | 2019-12-11 16:09:52 |
| FilingSummary.xml | 29489 | 2019-12-11 16:09:52 |
| Financial_Report.xlsx | 63258 | 2019-12-11 16:09:52 |
| MetaLinks.json | 584299 | 2019-12-11 16:09:52 |
| R1.htm | 52298 | 2019-12-11 16:09:52 |
| R10.htm | 8963 | 2019-12-11 16:09:52 |
| R11.htm | 72447 | 2019-12-11 16:09:52 |
| R12.htm | 27639 | 2019-12-11 16:09:52 |
| R13.htm | 100015 | 2019-12-11 16:09:52 |
| R14.htm | 5432 | 2019-12-11 16:09:52 |
| R15.htm | 6768 | 2019-12-11 16:09:52 |
| R16.htm | 21665 | 2019-12-11 16:09:52 |
| R17.htm | 37260 | 2019-12-11 16:09:52 |
| R18.htm | 41692 | 2019-12-11 16:09:52 |
| R19.htm | 6175 | 2019-12-11 16:09:52 |
| R2.htm | 51958 | 2019-12-11 16:09:52 |
| R20.htm | 38014 | 2019-12-11 16:09:52 |
| R21.htm | 22386 | 2019-12-11 16:09:52 |
| R22.htm | 19795 | 2019-12-11 16:09:52 |
| R23.htm | 77467 | 2019-12-11 16:09:52 |
| R24.htm | 20658 | 2019-12-11 16:09:52 |
| R25.htm | 98418 | 2019-12-11 16:09:52 |
| R26.htm | 21702 | 2019-12-11 16:09:52 |
| R27.htm | 34347 | 2019-12-11 16:09:52 |
| R28.htm | 44968 | 2019-12-11 16:09:52 |
| R29.htm | 21521 | 2019-12-11 16:09:52 |
| R3.htm | 80091 | 2019-12-11 16:09:52 |
| R30.htm | 22572 | 2019-12-11 16:09:52 |
| R31.htm | 14825 | 2019-12-11 16:09:52 |
| R32.htm | 23680 | 2019-12-11 16:09:52 |
| R33.htm | 26641 | 2019-12-11 16:09:52 |
| R34.htm | 7406 | 2019-12-11 16:09:52 |
| R35.htm | 30524 | 2019-12-11 16:09:52 |
| R36.htm | 16197 | 2019-12-11 16:09:52 |
| R37.htm | 40316 | 2019-12-11 16:09:52 |
| R38.htm | 40118 | 2019-12-11 16:09:52 |
| R39.htm | 13456 | 2019-12-11 16:09:52 |
| R4.htm | 19205 | 2019-12-11 16:09:52 |
| R40.htm | 14733 | 2019-12-11 16:09:52 |
| R41.htm | 9467 | 2019-12-11 16:09:52 |
| R42.htm | 88744 | 2019-12-11 16:09:52 |
| R43.htm | 50680 | 2019-12-11 16:09:52 |
| R44.htm | 4900 | 2019-12-11 16:09:52 |
| R45.htm | 6896 | 2019-12-11 16:09:52 |
| R46.htm | 15329 | 2019-12-11 16:09:52 |
| R47.htm | 21402 | 2019-12-11 16:09:52 |
| R48.htm | 41973 | 2019-12-11 16:09:52 |
| R49.htm | 9112 | 2019-12-11 16:09:52 |
| R5.htm | 98510 | 2019-12-11 16:09:52 |
| R6.htm | 4796 | 2019-12-11 16:09:52 |
| R7.htm | 81108 | 2019-12-11 16:09:52 |
| R8.htm | 44192 | 2019-12-11 16:09:52 |
| R9.htm | 22842 | 2019-12-11 16:09:52 |
| report.css | 2767 | 2019-12-11 16:09:52 |
| Show.js | 1085 | 2019-12-11 16:09:52 |