Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-012295-index-headers.html | 2023-04-10 16:15:41 | |
| 0000950170-23-012295-index.html | 2023-04-10 16:15:41 | |
| 0000950170-23-012295.txt | 2023-04-10 16:15:41 | |
 0000950170-23-012295-xbrl.zip | 294980 | 2023-04-10 16:15:41 |
| FilingSummary.xml | 48176 | 2023-04-10 16:15:41 |
| Financial_Report.xlsx | 106013 | 2023-04-10 16:15:41 |
| gbx-20230228.htm | 4424980 | 2023-04-10 16:15:41 |
| gbx-20230228.xsd | 70542 | 2023-04-10 16:15:41 |
| gbx-20230228_cal.xml | 75202 | 2023-04-10 16:15:41 |
| gbx-20230228_def.xml | 245576 | 2023-04-10 16:15:41 |
| gbx-20230228_htm.xml | 3705779 | 2023-04-10 16:15:41 |
| gbx-20230228_lab.xml | 550702 | 2023-04-10 16:15:41 |
| gbx-20230228_pre.xml | 415350 | 2023-04-10 16:15:41 |
| gbx-ex10_43.htm | 93331 | 2023-04-10 16:15:41 |
| gbx-ex31_1.htm | 21742 | 2023-04-10 16:15:41 |
| gbx-ex31_2.htm | 23185 | 2023-04-10 16:15:41 |
| gbx-ex32_1.htm | 13239 | 2023-04-10 16:15:41 |
| gbx-ex32_2.htm | 15908 | 2023-04-10 16:15:41 |
| MetaLinks.json | 856074 | 2023-04-10 16:15:41 |
| R1.htm | 53090 | 2023-04-10 16:15:41 |
| R10.htm | 21737 | 2023-04-10 16:15:41 |
| R11.htm | 62256 | 2023-04-10 16:15:41 |
| R12.htm | 30208 | 2023-04-10 16:15:41 |
| R13.htm | 8790 | 2023-04-10 16:15:41 |
| R14.htm | 67335 | 2023-04-10 16:15:41 |
| R15.htm | 58477 | 2023-04-10 16:15:41 |
| R16.htm | 33189 | 2023-04-10 16:15:41 |
| R17.htm | 56478 | 2023-04-10 16:15:41 |
| R18.htm | 122391 | 2023-04-10 16:15:41 |
| R19.htm | 140101 | 2023-04-10 16:15:41 |
| R2.htm | 100573 | 2023-04-10 16:15:41 |
| R20.htm | 9707 | 2023-04-10 16:15:41 |
| R21.htm | 322945 | 2023-04-10 16:15:41 |
| R22.htm | 398138 | 2023-04-10 16:15:41 |
| R23.htm | 117477 | 2023-04-10 16:15:41 |
| R24.htm | 22740 | 2023-04-10 16:15:41 |
| R25.htm | 123459 | 2023-04-10 16:15:41 |
| R26.htm | 8979 | 2023-04-10 16:15:41 |
| R27.htm | 51747 | 2023-04-10 16:15:41 |
| R28.htm | 30140 | 2023-04-10 16:15:41 |
| R29.htm | 60559 | 2023-04-10 16:15:41 |
| R3.htm | 14652 | 2023-04-10 16:15:41 |
| R30.htm | 29333 | 2023-04-10 16:15:41 |
| R31.htm | 32759 | 2023-04-10 16:15:41 |
| R32.htm | 55108 | 2023-04-10 16:15:41 |
| R33.htm | 122841 | 2023-04-10 16:15:41 |
| R34.htm | 137766 | 2023-04-10 16:15:41 |
| R35.htm | 317902 | 2023-04-10 16:15:41 |
| R36.htm | 393963 | 2023-04-10 16:15:41 |
| R37.htm | 108795 | 2023-04-10 16:15:41 |
| R38.htm | 119833 | 2023-04-10 16:15:41 |
| R39.htm | 42225 | 2023-04-10 16:15:41 |
| R4.htm | 113464 | 2023-04-10 16:15:41 |
| R40.htm | 17392 | 2023-04-10 16:15:41 |
| R41.htm | 12426 | 2023-04-10 16:15:41 |
| R42.htm | 15510 | 2023-04-10 16:15:41 |
| R43.htm | 12885 | 2023-04-10 16:15:41 |
| R44.htm | 10622 | 2023-04-10 16:15:41 |
| R45.htm | 30589 | 2023-04-10 16:15:41 |
| R46.htm | 16765 | 2023-04-10 16:15:41 |
| R47.htm | 73421 | 2023-04-10 16:15:41 |
| R48.htm | 16011 | 2023-04-10 16:15:41 |
| R49.htm | 19670 | 2023-04-10 16:15:41 |
| R5.htm | 49851 | 2023-04-10 16:15:41 |
| R50.htm | 12150 | 2023-04-10 16:15:41 |
| R51.htm | 22442 | 2023-04-10 16:15:41 |
| R52.htm | 31254 | 2023-04-10 16:15:41 |
| R53.htm | 18753 | 2023-04-10 16:15:41 |
| R54.htm | 8396 | 2023-04-10 16:15:41 |
| R55.htm | 8311 | 2023-04-10 16:15:41 |
| R56.htm | 44061 | 2023-04-10 16:15:41 |
| R57.htm | 6254 | 2023-04-10 16:15:41 |
| R58.htm | 4759 | 2023-04-10 16:15:41 |
| R59.htm | 18886 | 2023-04-10 16:15:41 |
| R6.htm | 7312 | 2023-04-10 16:15:41 |
| R60.htm | 22561 | 2023-04-10 16:15:41 |
| R61.htm | 32914 | 2023-04-10 16:15:41 |
| R62.htm | 28018 | 2023-04-10 16:15:41 |
| R63.htm | 4340 | 2023-04-10 16:15:41 |
| R64.htm | 55298 | 2023-04-10 16:15:41 |
| R65.htm | 11030 | 2023-04-10 16:15:41 |
| R66.htm | 29400 | 2023-04-10 16:15:41 |
| R67.htm | 16093 | 2023-04-10 16:15:41 |
| R68.htm | 9399 | 2023-04-10 16:15:41 |
| R69.htm | 22384 | 2023-04-10 16:15:41 |
| R7.htm | 127281 | 2023-04-10 16:15:41 |
| R70.htm | 6761 | 2023-04-10 16:15:41 |
| R71.htm | 6378 | 2023-04-10 16:15:41 |
| R72.htm | 20009 | 2023-04-10 16:15:41 |
| R73.htm | 25442 | 2023-04-10 16:15:41 |
| R74.htm | 9769 | 2023-04-10 16:15:41 |
| R8.htm | 4759 | 2023-04-10 16:15:41 |
| R9.htm | 121989 | 2023-04-10 16:15:41 |
| report.css | 2767 | 2023-04-10 16:15:41 |
| Show.js | 1085 | 2023-04-10 16:15:41 |