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|---|---|---|
 0001193125-21-233557-index-headers.html | 2021-08-02 18:25:59 | |
| 0001193125-21-233557-index.html | 2021-08-02 18:25:59 | |
| 0001193125-21-233557.txt | 2021-08-02 18:25:59 | |
 0001193125-21-233557-xbrl.zip | 40223 | 2021-08-02 18:25:59 |
 BarChart1.png | 15919 | 2021-08-02 18:25:59 |
| d175646d497.htm | 6966 | 2021-08-02 18:25:59 |
| FilingSummary.xml | 3530 | 2021-08-02 18:25:59 |
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| ist-20210719.xml | 47311 | 2021-08-02 18:25:59 |
| ist-20210719.xsd | 8351 | 2021-08-02 18:25:59 |
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| ist-20210719_def.xml | 218103 | 2021-08-02 18:25:59 |
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| R2.htm | 94046 | 2021-08-02 18:25:59 |
| R7.htm | 183857 | 2021-08-02 18:25:59 |
| R8.htm | 3937 | 2021-08-02 18:25:59 |
| report.css | 2767 | 2021-08-02 18:25:59 |
| Show.js | 1085 | 2021-08-02 18:25:59 |