Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000768835-23-000033-index-headers.html | 2023-03-28 16:06:49 | |
| 0000768835-23-000033-index.html | 2023-03-28 16:06:49 | |
| 0000768835-23-000033.txt | 2023-03-28 16:06:49 | |
 0000768835-23-000033-xbrl.zip | 442919 | 2023-03-28 16:06:49 |
| big-20230128.htm | 1620763 | 2023-03-28 16:06:49 |
| big-20230128.xsd | 54334 | 2023-03-28 16:06:49 |
| big-20230128_cal.xml | 71167 | 2023-03-28 16:06:49 |
| big-20230128_def.xml | 352729 | 2023-03-28 16:06:49 |
 big-20230128_g1.jpg | 189933 | 2023-03-28 16:06:49 |
| big-20230128_htm.xml | 1081350 | 2023-03-28 16:06:49 |
| big-20230128_lab.xml | 846555 | 2023-03-28 16:06:49 |
| big-20230128_pre.xml | 518801 | 2023-03-28 16:06:49 |
| big-2023128xex21.htm | 10338 | 2023-03-28 16:06:49 |
| big-2023128xex23.htm | 5092 | 2023-03-28 16:06:49 |
| big-2023128xex24.htm | 12570 | 2023-03-28 16:06:49 |
| big-2023128xex311.htm | 10976 | 2023-03-28 16:06:49 |
| big-2023128xex312.htm | 11521 | 2023-03-28 16:06:49 |
| big-2023128xex321.htm | 5251 | 2023-03-28 16:06:49 |
| big-2023128xex322.htm | 5768 | 2023-03-28 16:06:49 |
| FilingSummary.xml | 31107 | 2023-03-28 16:06:49 |
| Financial_Report.xlsx | 100849 | 2023-03-28 16:06:49 |
| MetaLinks.json | 853417 | 2023-03-28 16:06:49 |
| R1.htm | 67682 | 2023-03-28 16:06:49 |
| R10.htm | 20685 | 2023-03-28 16:06:49 |
| R11.htm | 22779 | 2023-03-28 16:06:49 |
| R12.htm | 57752 | 2023-03-28 16:06:49 |
| R13.htm | 42521 | 2023-03-28 16:06:49 |
| R14.htm | 62249 | 2023-03-28 16:06:49 |
| R15.htm | 102423 | 2023-03-28 16:06:49 |
| R16.htm | 8137 | 2023-03-28 16:06:49 |
| R17.htm | 10821 | 2023-03-28 16:06:49 |
| R18.htm | 27594 | 2023-03-28 16:06:49 |
| R19.htm | 10161 | 2023-03-28 16:06:49 |
| R2.htm | 67887 | 2023-03-28 16:06:49 |
| R20.htm | 103596 | 2023-03-28 16:06:49 |
| R21.htm | 31550 | 2023-03-28 16:06:49 |
| R22.htm | 15373 | 2023-03-28 16:06:49 |
| R23.htm | 14349 | 2023-03-28 16:06:49 |
| R24.htm | 56095 | 2023-03-28 16:06:49 |
| R25.htm | 39293 | 2023-03-28 16:06:49 |
| R26.htm | 56060 | 2023-03-28 16:06:49 |
| R27.htm | 108767 | 2023-03-28 16:06:49 |
| R28.htm | 20242 | 2023-03-28 16:06:49 |
| R29.htm | 16683 | 2023-03-28 16:06:49 |
| R3.htm | 95803 | 2023-03-28 16:06:49 |
| R30.htm | 24572 | 2023-03-28 16:06:49 |
| R31.htm | 52930 | 2023-03-28 16:06:49 |
| R32.htm | 35741 | 2023-03-28 16:06:49 |
| R33.htm | 4449 | 2023-03-28 16:06:49 |
| R34.htm | 121090 | 2023-03-28 16:06:49 |
| R35.htm | 19149 | 2023-03-28 16:06:49 |
| R36.htm | 15648 | 2023-03-28 16:06:49 |
| R37.htm | 14369 | 2023-03-28 16:06:49 |
| R38.htm | 93534 | 2023-03-28 16:06:49 |
| R39.htm | 8541 | 2023-03-28 16:06:49 |
| R4.htm | 19283 | 2023-03-28 16:06:49 |
| R40.htm | 147159 | 2023-03-28 16:06:49 |
| R41.htm | 19636 | 2023-03-28 16:06:49 |
| R42.htm | 8651 | 2023-03-28 16:06:49 |
| R43.htm | 4056 | 2023-03-28 16:06:49 |
| R44.htm | 24446 | 2023-03-28 16:06:49 |
| R45.htm | 22739 | 2023-03-28 16:06:49 |
| R46.htm | 8600 | 2023-03-28 16:06:49 |
| R5.htm | 73440 | 2023-03-28 16:06:49 |
| R6.htm | 4600 | 2023-03-28 16:06:49 |
| R7.htm | 92983 | 2023-03-28 16:06:49 |
| R8.htm | 26204 | 2023-03-28 16:06:49 |
| R9.htm | 68856 | 2023-03-28 16:06:49 |
| report.css | 2767 | 2023-03-28 16:06:49 |
| Show.js | 1085 | 2023-03-28 16:06:49 |