Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-009172-index-headers.html | 2020-01-16 18:56:12 | |
| 0001193125-20-009172-index.html | 2020-01-16 18:56:12 | |
| 0001193125-20-009172.txt | 2020-01-16 18:56:12 | |
 0001193125-20-009172-xbrl.zip | 985325 | 2020-01-16 18:56:12 |
 BarChart1.png | 11881 | 2020-01-16 18:56:12 |
 BarChart10.png | 12141 | 2020-01-16 18:56:12 |
 BarChart11.png | 12165 | 2020-01-16 18:56:12 |
 BarChart12.png | 9591 | 2020-01-16 18:56:12 |
 BarChart13.png | 9629 | 2020-01-16 18:56:12 |
 BarChart14.png | 8035 | 2020-01-16 18:56:12 |
 BarChart15.png | 27225 | 2020-01-16 18:56:12 |
 BarChart16.png | 20351 | 2020-01-16 18:56:12 |
 BarChart17.png | 26379 | 2020-01-16 18:56:12 |
 BarChart18.png | 21755 | 2020-01-16 18:56:12 |
 BarChart19.png | 19757 | 2020-01-16 18:56:12 |
 BarChart2.png | 12269 | 2020-01-16 18:56:12 |
 BarChart20.png | 19320 | 2020-01-16 18:56:12 |
 BarChart21.png | 9787 | 2020-01-16 18:56:12 |
 BarChart22.png | 19532 | 2020-01-16 18:56:12 |
 BarChart23.png | 19322 | 2020-01-16 18:56:12 |
 BarChart24.png | 26387 | 2020-01-16 18:56:12 |
 BarChart25.png | 25291 | 2020-01-16 18:56:12 |
 BarChart26.png | 26917 | 2020-01-16 18:56:12 |
 BarChart27.png | 22143 | 2020-01-16 18:56:12 |
 BarChart28.png | 28114 | 2020-01-16 18:56:12 |
 BarChart29.png | 26037 | 2020-01-16 18:56:12 |
 BarChart3.png | 14400 | 2020-01-16 18:56:12 |
 BarChart30.png | 25268 | 2020-01-16 18:56:12 |
 BarChart31.png | 15045 | 2020-01-16 18:56:12 |
 BarChart32.png | 13972 | 2020-01-16 18:56:12 |
 BarChart33.png | 16792 | 2020-01-16 18:56:12 |
 BarChart34.png | 30583 | 2020-01-16 18:56:12 |
 BarChart35.png | 21298 | 2020-01-16 18:56:12 |
 BarChart4.png | 15169 | 2020-01-16 18:56:12 |
 BarChart5.png | 12201 | 2020-01-16 18:56:12 |
 BarChart6.png | 13682 | 2020-01-16 18:56:12 |
 BarChart7.png | 12968 | 2020-01-16 18:56:12 |
 BarChart8.png | 12193 | 2020-01-16 18:56:12 |
 BarChart9.png | 11691 | 2020-01-16 18:56:12 |
| d750097d485bpos.htm | 36271 | 2020-01-16 18:56:12 |
| FilingSummary.xml | 50407 | 2020-01-16 18:56:12 |
| ist-20191217.xml | 1860249 | 2020-01-16 18:56:12 |
| ist-20191217.xsd | 195893 | 2020-01-16 18:56:12 |
| ist-20191217_cal.xml | 4793 | 2020-01-16 18:56:12 |
| ist-20191217_def.xml | 8011262 | 2020-01-16 18:56:12 |
| ist-20191217_lab.xml | 312535 | 2020-01-16 18:56:12 |
| ist-20191217_pre.xml | 6275513 | 2020-01-16 18:56:12 |
| R1.htm | 18248 | 2020-01-16 18:56:12 |
| R100.htm | 93261 | 2020-01-16 18:56:12 |
| R105.htm | 181939 | 2020-01-16 18:56:12 |
| R106.htm | 94988 | 2020-01-16 18:56:12 |
| R111.htm | 181717 | 2020-01-16 18:56:12 |
| R112.htm | 85949 | 2020-01-16 18:56:12 |
| R117.htm | 174264 | 2020-01-16 18:56:12 |
| R118.htm | 86659 | 2020-01-16 18:56:12 |
| R123.htm | 174968 | 2020-01-16 18:56:12 |
| R124.htm | 86314 | 2020-01-16 18:56:12 |
| R129.htm | 172311 | 2020-01-16 18:56:12 |
| R13.htm | 186213 | 2020-01-16 18:56:12 |
| R130.htm | 78892 | 2020-01-16 18:56:12 |
| R135.htm | 160631 | 2020-01-16 18:56:12 |
| R136.htm | 87803 | 2020-01-16 18:56:12 |
| R14.htm | 99447 | 2020-01-16 18:56:12 |
| R141.htm | 176226 | 2020-01-16 18:56:12 |
| R142.htm | 86915 | 2020-01-16 18:56:12 |
| R147.htm | 173028 | 2020-01-16 18:56:12 |
| R148.htm | 92450 | 2020-01-16 18:56:12 |
| R153.htm | 185577 | 2020-01-16 18:56:12 |
| R154.htm | 91015 | 2020-01-16 18:56:12 |
| R159.htm | 180099 | 2020-01-16 18:56:12 |
| R160.htm | 57590 | 2020-01-16 18:56:12 |
| R163.htm | 94557 | 2020-01-16 18:56:12 |
| R164.htm | 57529 | 2020-01-16 18:56:12 |
| R167.htm | 94514 | 2020-01-16 18:56:12 |
| R168.htm | 91135 | 2020-01-16 18:56:12 |
| R173.htm | 180211 | 2020-01-16 18:56:12 |
| R174.htm | 86616 | 2020-01-16 18:56:12 |
| R179.htm | 174931 | 2020-01-16 18:56:12 |
| R180.htm | 94805 | 2020-01-16 18:56:12 |
| R185.htm | 184221 | 2020-01-16 18:56:12 |
| R186.htm | 91642 | 2020-01-16 18:56:12 |
| R19.htm | 192961 | 2020-01-16 18:56:12 |
| R191.htm | 180681 | 2020-01-16 18:56:12 |
| R192.htm | 91672 | 2020-01-16 18:56:12 |
| R197.htm | 180867 | 2020-01-16 18:56:12 |
| R198.htm | 83782 | 2020-01-16 18:56:12 |
| R2.htm | 94150 | 2020-01-16 18:56:12 |
| R20.htm | 94659 | 2020-01-16 18:56:12 |
| R203.htm | 168570 | 2020-01-16 18:56:12 |
| R204.htm | 83112 | 2020-01-16 18:56:12 |
| R209.htm | 167524 | 2020-01-16 18:56:12 |
| R210.htm | 85347 | 2020-01-16 18:56:12 |
| R215.htm | 170137 | 2020-01-16 18:56:12 |
| R216.htm | 96183 | 2020-01-16 18:56:12 |
| R221.htm | 185840 | 2020-01-16 18:56:12 |
| R222.htm | 85919 | 2020-01-16 18:56:12 |
| R227.htm | 171910 | 2020-01-16 18:56:12 |
| R228.htm | 7481 | 2020-01-16 18:56:12 |
| R25.htm | 188169 | 2020-01-16 18:56:12 |
| R26.htm | 94593 | 2020-01-16 18:56:12 |
| R31.htm | 187728 | 2020-01-16 18:56:12 |
| R32.htm | 95646 | 2020-01-16 18:56:12 |
| R37.htm | 189158 | 2020-01-16 18:56:12 |
| R38.htm | 95841 | 2020-01-16 18:56:12 |
| R43.htm | 188985 | 2020-01-16 18:56:12 |
| R44.htm | 95535 | 2020-01-16 18:56:12 |
| R49.htm | 188665 | 2020-01-16 18:56:12 |
| R50.htm | 94318 | 2020-01-16 18:56:12 |
| R55.htm | 187463 | 2020-01-16 18:56:12 |
| R56.htm | 94584 | 2020-01-16 18:56:12 |
| R61.htm | 187723 | 2020-01-16 18:56:12 |
| R62.htm | 94523 | 2020-01-16 18:56:12 |
| R67.htm | 187641 | 2020-01-16 18:56:12 |
| R68.htm | 80633 | 2020-01-16 18:56:12 |
| R7.htm | 187291 | 2020-01-16 18:56:12 |
| R73.htm | 162403 | 2020-01-16 18:56:12 |
| R74.htm | 74642 | 2020-01-16 18:56:12 |
| R79.htm | 156411 | 2020-01-16 18:56:12 |
| R8.htm | 93067 | 2020-01-16 18:56:12 |
| R80.htm | 57098 | 2020-01-16 18:56:12 |
| R83.htm | 96114 | 2020-01-16 18:56:12 |
| R84.htm | 55006 | 2020-01-16 18:56:12 |
| R87.htm | 95935 | 2020-01-16 18:56:12 |
| R88.htm | 80848 | 2020-01-16 18:56:12 |
| R93.htm | 164513 | 2020-01-16 18:56:12 |
| R94.htm | 90939 | 2020-01-16 18:56:12 |
| R99.htm | 177673 | 2020-01-16 18:56:12 |
| report.css | 2767 | 2020-01-16 18:56:12 |
| Show.js | 1086 | 2020-01-16 18:56:12 |