Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000768835-17-000087-index-headers.html | 2017-09-06 16:06:03 | |
| 0000768835-17-000087-index.html | 2017-09-06 16:06:03 | |
| 0000768835-17-000087.txt | 2017-09-06 16:06:03 | |
 0000768835-17-000087-xbrl.zip | 162010 | 2017-09-06 16:06:03 |
| big-20170729.xml | 840433 | 2017-09-06 16:06:03 |
| big-20170729.xsd | 33041 | 2017-09-06 16:06:03 |
| big-20170729_cal.xml | 66061 | 2017-09-06 16:06:03 |
| big-20170729_def.xml | 282288 | 2017-09-06 16:06:03 |
| big-20170729_lab.xml | 587042 | 2017-09-06 16:06:03 |
| big-20170729_pre.xml | 344752 | 2017-09-06 16:06:03 |
| big-2017729x10q.htm | 886848 | 2017-09-06 16:06:03 |
| big-2017729xex101.htm | 55947 | 2017-09-06 16:06:03 |
| big-2017729xex311.htm | 14144 | 2017-09-06 16:06:03 |
| big-2017729xex312.htm | 14624 | 2017-09-06 16:06:03 |
| big-2017729xex321.htm | 7021 | 2017-09-06 16:06:03 |
| big-2017729xex322.htm | 7125 | 2017-09-06 16:06:03 |
| FilingSummary.xml | 26290 | 2017-09-06 16:06:03 |
| Financial_Report.xlsx | 59598 | 2017-09-06 16:06:03 |
| R1.htm | 25769 | 2017-09-06 16:06:03 |
| R10.htm | 41786 | 2017-09-06 16:06:03 |
| R11.htm | 8292 | 2017-09-06 16:06:03 |
| R12.htm | 8602 | 2017-09-06 16:06:03 |
| R13.htm | 23324 | 2017-09-06 16:06:03 |
| R14.htm | 91653 | 2017-09-06 16:06:03 |
| R15.htm | 22068 | 2017-09-06 16:06:03 |
| R16.htm | 5661 | 2017-09-06 16:06:03 |
| R17.htm | 22424 | 2017-09-06 16:06:03 |
| R18.htm | 41093 | 2017-09-06 16:06:03 |
| R19.htm | 17820 | 2017-09-06 16:06:03 |
| R2.htm | 47119 | 2017-09-06 16:06:03 |
| R20.htm | 46008 | 2017-09-06 16:06:03 |
| R21.htm | 33173 | 2017-09-06 16:06:03 |
| R22.htm | 22955 | 2017-09-06 16:06:03 |
| R23.htm | 17306 | 2017-09-06 16:06:03 |
| R24.htm | 87839 | 2017-09-06 16:06:03 |
| R25.htm | 22042 | 2017-09-06 16:06:03 |
| R26.htm | 37724 | 2017-09-06 16:06:03 |
| R27.htm | 16727 | 2017-09-06 16:06:03 |
| R28.htm | 48721 | 2017-09-06 16:06:03 |
| R29.htm | 25042 | 2017-09-06 16:06:03 |
| R3.htm | 16595 | 2017-09-06 16:06:03 |
| R30.htm | 17718 | 2017-09-06 16:06:03 |
| R31.htm | 18831 | 2017-09-06 16:06:03 |
| R32.htm | 7864 | 2017-09-06 16:06:03 |
| R33.htm | 11401 | 2017-09-06 16:06:03 |
| R34.htm | 13788 | 2017-09-06 16:06:03 |
| R35.htm | 12110 | 2017-09-06 16:06:03 |
| R36.htm | 82495 | 2017-09-06 16:06:03 |
| R37.htm | 55757 | 2017-09-06 16:06:03 |
| R38.htm | 18986 | 2017-09-06 16:06:03 |
| R39.htm | 4898 | 2017-09-06 16:06:03 |
| R4.htm | 7507 | 2017-09-06 16:06:03 |
| R40.htm | 15638 | 2017-09-06 16:06:03 |
| R41.htm | 20597 | 2017-09-06 16:06:03 |
| R42.htm | 13765 | 2017-09-06 16:06:03 |
| R43.htm | 45479 | 2017-09-06 16:06:03 |
| R5.htm | 74310 | 2017-09-06 16:06:03 |
| R6.htm | 19283 | 2017-09-06 16:06:03 |
| R7.htm | 87635 | 2017-09-06 16:06:03 |
| R8.htm | 4986 | 2017-09-06 16:06:03 |
| R9.htm | 77274 | 2017-09-06 16:06:03 |
| report.css | 2767 | 2017-09-06 16:06:03 |
| Show.js | 1410 | 2017-09-06 16:06:03 |