Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000105770-18-000015-index-headers.html | 2018-05-08 16:58:24 | |
| 0000105770-18-000015-index.html | 2018-05-08 16:58:24 | |
| 0000105770-18-000015.txt | 2018-05-08 16:58:24 | |
 0000105770-18-000015-xbrl.zip | 184514 | 2018-05-08 16:58:24 |
| ex311q12018.htm | 11163 | 2018-05-08 16:58:24 |
| ex312q12018.htm | 11193 | 2018-05-08 16:58:24 |
| ex321q12018.htm | 4758 | 2018-05-08 16:58:24 |
| ex322q12018.htm | 4913 | 2018-05-08 16:58:24 |
| FilingSummary.xml | 31776 | 2018-05-08 16:58:24 |
| Financial_Report.xlsx | 69321 | 2018-05-08 16:58:24 |
| R1.htm | 25130 | 2018-05-08 16:58:24 |
| R10.htm | 16297 | 2018-05-08 16:58:24 |
| R11.htm | 119192 | 2018-05-08 16:58:24 |
| R12.htm | 16833 | 2018-05-08 16:58:24 |
| R13.htm | 13833 | 2018-05-08 16:58:24 |
| R14.htm | 6458 | 2018-05-08 16:58:24 |
| R15.htm | 26179 | 2018-05-08 16:58:24 |
| R16.htm | 68235 | 2018-05-08 16:58:24 |
| R17.htm | 91533 | 2018-05-08 16:58:24 |
| R18.htm | 10852 | 2018-05-08 16:58:24 |
| R19.htm | 68430 | 2018-05-08 16:58:24 |
| R2.htm | 51390 | 2018-05-08 16:58:24 |
| R20.htm | 75148 | 2018-05-08 16:58:24 |
| R21.htm | 50587 | 2018-05-08 16:58:24 |
| R22.htm | 9604 | 2018-05-08 16:58:24 |
| R23.htm | 5899 | 2018-05-08 16:58:24 |
| R24.htm | 38294 | 2018-05-08 16:58:24 |
| R25.htm | 20491 | 2018-05-08 16:58:24 |
| R26.htm | 112720 | 2018-05-08 16:58:24 |
| R27.htm | 14157 | 2018-05-08 16:58:24 |
| R28.htm | 14581 | 2018-05-08 16:58:24 |
| R29.htm | 22646 | 2018-05-08 16:58:24 |
| R3.htm | 21908 | 2018-05-08 16:58:24 |
| R30.htm | 62702 | 2018-05-08 16:58:24 |
| R31.htm | 84941 | 2018-05-08 16:58:24 |
| R32.htm | 65325 | 2018-05-08 16:58:24 |
| R33.htm | 76366 | 2018-05-08 16:58:24 |
| R34.htm | 45393 | 2018-05-08 16:58:24 |
| R35.htm | 32290 | 2018-05-08 16:58:24 |
| R36.htm | 19848 | 2018-05-08 16:58:24 |
| R37.htm | 46520 | 2018-05-08 16:58:24 |
| R38.htm | 32274 | 2018-05-08 16:58:24 |
| R39.htm | 26619 | 2018-05-08 16:58:24 |
| R4.htm | 10212 | 2018-05-08 16:58:24 |
| R40.htm | 24423 | 2018-05-08 16:58:24 |
| R41.htm | 12347 | 2018-05-08 16:58:24 |
| R42.htm | 7917 | 2018-05-08 16:58:24 |
| R43.htm | 30820 | 2018-05-08 16:58:24 |
| R44.htm | 50679 | 2018-05-08 16:58:24 |
| R45.htm | 27532 | 2018-05-08 16:58:24 |
| R46.htm | 26673 | 2018-05-08 16:58:24 |
| R47.htm | 10078 | 2018-05-08 16:58:24 |
| R48.htm | 6685 | 2018-05-08 16:58:24 |
| R49.htm | 33373 | 2018-05-08 16:58:24 |
| R5.htm | 91938 | 2018-05-08 16:58:24 |
| R50.htm | 33426 | 2018-05-08 16:58:24 |
| R51.htm | 28434 | 2018-05-08 16:58:24 |
| R52.htm | 39554 | 2018-05-08 16:58:24 |
| R53.htm | 20267 | 2018-05-08 16:58:24 |
| R54.htm | 48549 | 2018-05-08 16:58:24 |
| R55.htm | 9945 | 2018-05-08 16:58:24 |
| R56.htm | 16277 | 2018-05-08 16:58:24 |
| R57.htm | 40981 | 2018-05-08 16:58:24 |
| R6.htm | 19378 | 2018-05-08 16:58:24 |
| R7.htm | 39687 | 2018-05-08 16:58:24 |
| R8.htm | 60461 | 2018-05-08 16:58:24 |
| R9.htm | 7563 | 2018-05-08 16:58:24 |
| report.css | 2767 | 2018-05-08 16:58:24 |
| Show.js | 1410 | 2018-05-08 16:58:24 |
| wst-20180331.xml | 1485421 | 2018-05-08 16:58:24 |
| wst-20180331.xsd | 38597 | 2018-05-08 16:58:24 |
| wst-20180331_cal.xml | 81982 | 2018-05-08 16:58:24 |
| wst-20180331_def.xml | 239651 | 2018-05-08 16:58:24 |
| wst-20180331_lab.xml | 631959 | 2018-05-08 16:58:24 |
| wst-20180331_pre.xml | 383117 | 2018-05-08 16:58:24 |
| wst10q33118.htm | 1045301 | 2018-05-08 16:58:24 |