Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000768835-17-000102-index-headers.html | 2017-12-06 16:07:36 | |
| 0000768835-17-000102-index.html | 2017-12-06 16:07:36 | |
| 0000768835-17-000102.txt | 2017-12-06 16:07:36 | |
 0000768835-17-000102-xbrl.zip | 164428 | 2017-12-06 16:07:36 |
| big-20171028.xml | 900739 | 2017-12-06 16:07:36 |
| big-20171028.xsd | 33041 | 2017-12-06 16:07:36 |
| big-20171028ex101.htm | 47042 | 2017-12-06 16:07:36 |
| big-20171028x10q.htm | 907952 | 2017-12-06 16:07:36 |
| big-20171028xex311.htm | 15780 | 2017-12-06 16:07:36 |
| big-20171028xex312.htm | 15025 | 2017-12-06 16:07:36 |
| big-20171028xex321.htm | 8720 | 2017-12-06 16:07:36 |
| big-20171028xex322.htm | 7638 | 2017-12-06 16:07:36 |
| big-20171028_cal.xml | 66061 | 2017-12-06 16:07:36 |
| big-20171028_def.xml | 282288 | 2017-12-06 16:07:36 |
| big-20171028_lab.xml | 588059 | 2017-12-06 16:07:36 |
| big-20171028_pre.xml | 344752 | 2017-12-06 16:07:36 |
| FilingSummary.xml | 26516 | 2017-12-06 16:07:36 |
| Financial_Report.xlsx | 60186 | 2017-12-06 16:07:36 |
| R1.htm | 25769 | 2017-12-06 16:07:36 |
| R10.htm | 41668 | 2017-12-06 16:07:36 |
| R11.htm | 8294 | 2017-12-06 16:07:36 |
| R12.htm | 8605 | 2017-12-06 16:07:36 |
| R13.htm | 24780 | 2017-12-06 16:07:36 |
| R14.htm | 110040 | 2017-12-06 16:07:36 |
| R15.htm | 22069 | 2017-12-06 16:07:36 |
| R16.htm | 5663 | 2017-12-06 16:07:36 |
| R17.htm | 23508 | 2017-12-06 16:07:36 |
| R18.htm | 41090 | 2017-12-06 16:07:36 |
| R19.htm | 17819 | 2017-12-06 16:07:36 |
| R2.htm | 47125 | 2017-12-06 16:07:36 |
| R20.htm | 45686 | 2017-12-06 16:07:36 |
| R21.htm | 33041 | 2017-12-06 16:07:36 |
| R22.htm | 22966 | 2017-12-06 16:07:36 |
| R23.htm | 19253 | 2017-12-06 16:07:36 |
| R24.htm | 105925 | 2017-12-06 16:07:36 |
| R25.htm | 22043 | 2017-12-06 16:07:36 |
| R26.htm | 37720 | 2017-12-06 16:07:36 |
| R27.htm | 16726 | 2017-12-06 16:07:36 |
| R28.htm | 48399 | 2017-12-06 16:07:36 |
| R29.htm | 25044 | 2017-12-06 16:07:36 |
| R3.htm | 16579 | 2017-12-06 16:07:36 |
| R30.htm | 17722 | 2017-12-06 16:07:36 |
| R31.htm | 18830 | 2017-12-06 16:07:36 |
| R32.htm | 7864 | 2017-12-06 16:07:36 |
| R33.htm | 11401 | 2017-12-06 16:07:36 |
| R34.htm | 13787 | 2017-12-06 16:07:36 |
| R35.htm | 12502 | 2017-12-06 16:07:36 |
| R36.htm | 85106 | 2017-12-06 16:07:36 |
| R37.htm | 56846 | 2017-12-06 16:07:36 |
| R38.htm | 18988 | 2017-12-06 16:07:36 |
| R39.htm | 4898 | 2017-12-06 16:07:36 |
| R4.htm | 7506 | 2017-12-06 16:07:36 |
| R40.htm | 16083 | 2017-12-06 16:07:36 |
| R41.htm | 20594 | 2017-12-06 16:07:36 |
| R42.htm | 13765 | 2017-12-06 16:07:36 |
| R43.htm | 45477 | 2017-12-06 16:07:36 |
| R5.htm | 74312 | 2017-12-06 16:07:36 |
| R6.htm | 19283 | 2017-12-06 16:07:36 |
| R7.htm | 87624 | 2017-12-06 16:07:36 |
| R8.htm | 4986 | 2017-12-06 16:07:36 |
| R9.htm | 77285 | 2017-12-06 16:07:36 |
| report.css | 2767 | 2017-12-06 16:07:36 |
| Show.js | 1410 | 2017-12-06 16:07:36 |