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|---|---|---|
 0001193125-20-076869-index-headers.html | 2020-03-18 12:51:04 | |
| 0001193125-20-076869-index.html | 2020-03-18 12:51:04 | |
| 0001193125-20-076869.txt | 2020-03-18 12:51:04 | |
 0001193125-20-076869-xbrl.zip | 69936 | 2020-03-18 12:51:04 |
 BarChart1.png | 7312 | 2020-03-18 12:51:04 |
 BarChart2.png | 7356 | 2020-03-18 12:51:04 |
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| bf1-20200226_lab.xml | 147321 | 2020-03-18 12:51:04 |
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| d837931d485bpos.htm | 34757 | 2020-03-18 12:51:04 |
| FilingSummary.xml | 4968 | 2020-03-18 12:51:04 |
 g837931snap1.jpg | 2242 | 2020-03-18 12:51:04 |
| R1.htm | 18245 | 2020-03-18 12:51:04 |
| R13.htm | 168026 | 2020-03-18 12:51:04 |
| R14.htm | 7477 | 2020-03-18 12:51:04 |
| R2.htm | 102256 | 2020-03-18 12:51:04 |
| R7.htm | 168151 | 2020-03-18 12:51:04 |
| R8.htm | 102162 | 2020-03-18 12:51:04 |
| report.css | 2767 | 2020-03-18 12:51:04 |
| Show.js | 1085 | 2020-03-18 12:51:04 |