Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000768835-22-000099-index-headers.html | 2022-06-08 16:14:23 | |
| 0000768835-22-000099-index.html | 2022-06-08 16:14:23 | |
| 0000768835-22-000099.txt | 2022-06-08 16:14:23 | |
 0000768835-22-000099-xbrl.zip | 177402 | 2022-06-08 16:14:23 |
| big-20220430.htm | 756079 | 2022-06-08 16:14:23 |
| big-20220430.xsd | 26845 | 2022-06-08 16:14:23 |
| big-20220430_cal.xml | 49009 | 2022-06-08 16:14:23 |
| big-20220430_def.xml | 194612 | 2022-06-08 16:14:23 |
| big-20220430_htm.xml | 460790 | 2022-06-08 16:14:23 |
| big-20220430_lab.xml | 411879 | 2022-06-08 16:14:23 |
| big-20220430_pre.xml | 253945 | 2022-06-08 16:14:23 |
| big-2022430xex102executive.htm | 45845 | 2022-06-08 16:14:23 |
| big-2022430xex103seniorexe.htm | 45618 | 2022-06-08 16:14:23 |
| big-2022430xex311.htm | 11035 | 2022-06-08 16:14:23 |
| big-2022430xex312.htm | 11511 | 2022-06-08 16:14:23 |
| big-2022430xex321.htm | 5267 | 2022-06-08 16:14:23 |
| big-2022430xex322.htm | 5811 | 2022-06-08 16:14:23 |
| FilingSummary.xml | 17757 | 2022-06-08 16:14:23 |
| Financial_Report.xlsx | 42624 | 2022-06-08 16:14:23 |
| MetaLinks.json | 437813 | 2022-06-08 16:14:23 |
| R1.htm | 52417 | 2022-06-08 16:14:23 |
| R10.htm | 12887 | 2022-06-08 16:14:23 |
| R11.htm | 20568 | 2022-06-08 16:14:23 |
| R12.htm | 39728 | 2022-06-08 16:14:23 |
| R13.htm | 8983 | 2022-06-08 16:14:23 |
| R14.htm | 6033 | 2022-06-08 16:14:23 |
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| R18.htm | 39814 | 2022-06-08 16:14:23 |
| R19.htm | 16572 | 2022-06-08 16:14:23 |
| R2.htm | 75558 | 2022-06-08 16:14:23 |
| R20.htm | 12224 | 2022-06-08 16:14:23 |
| R21.htm | 24236 | 2022-06-08 16:14:23 |
| R22.htm | 25475 | 2022-06-08 16:14:23 |
| R23.htm | 7189 | 2022-06-08 16:14:23 |
| R24.htm | 12689 | 2022-06-08 16:14:23 |
| R25.htm | 8560 | 2022-06-08 16:14:23 |
| R26.htm | 67195 | 2022-06-08 16:14:23 |
| R27.htm | 4907 | 2022-06-08 16:14:23 |
| R28.htm | 21915 | 2022-06-08 16:14:23 |
| R3.htm | 97388 | 2022-06-08 16:14:23 |
| R4.htm | 19877 | 2022-06-08 16:14:23 |
| R5.htm | 60391 | 2022-06-08 16:14:23 |
| R6.htm | 4499 | 2022-06-08 16:14:23 |
| R7.htm | 83286 | 2022-06-08 16:14:23 |
| R8.htm | 19048 | 2022-06-08 16:14:23 |
| R9.htm | 25580 | 2022-06-08 16:14:23 |
| report.css | 2767 | 2022-06-08 16:14:23 |
| Show.js | 1085 | 2022-06-08 16:14:23 |