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| 0001193125-16-783556-index.html | 2016-12-02 12:37:27 | |
| 0001193125-16-783556.txt | 2016-12-02 12:37:27 | |
 0001193125-16-783556-xbrl.zip | 130462 | 2016-12-02 12:37:27 |
 BarChart1.png | 27400 | 2016-12-02 12:37:27 |
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| d285011d485bpos.htm | 20299 | 2016-12-02 12:37:27 |
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| imp-20161128.xml | 241270 | 2016-12-02 12:37:27 |
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| imp-20161128_cal.xml | 4778 | 2016-12-02 12:37:27 |
| imp-20161128_def.xml | 1035603 | 2016-12-02 12:37:27 |
| imp-20161128_lab.xml | 153217 | 2016-12-02 12:37:27 |
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| R1.htm | 16200 | 2016-12-02 12:37:27 |
| R15.htm | 218267 | 2016-12-02 12:37:27 |
| R16.htm | 127257 | 2016-12-02 12:37:27 |
| R2.htm | 124463 | 2016-12-02 12:37:27 |
| R22.htm | 217561 | 2016-12-02 12:37:27 |
| R23.htm | 127209 | 2016-12-02 12:37:27 |
| R29.htm | 217467 | 2016-12-02 12:37:27 |
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| R36.htm | 212365 | 2016-12-02 12:37:27 |
| R37.htm | 7490 | 2016-12-02 12:37:27 |
| R8.htm | 212192 | 2016-12-02 12:37:27 |
| R9.htm | 127962 | 2016-12-02 12:37:27 |
| report.css | 2767 | 2016-12-02 12:37:27 |
| Show.js | 1410 | 2016-12-02 12:37:27 |