Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-162353-index-headers.html | 2020-06-05 18:23:13 | |
| 0001193125-20-162353-index.html | 2020-06-05 18:23:13 | |
| 0001193125-20-162353.txt | 2020-06-05 18:23:13 | |
 0001193125-20-162353-xbrl.zip | 23802 | 2020-06-05 18:23:13 |
| altr-20200602.xsd | 3062 | 2020-06-05 18:23:13 |
| altr-20200602_lab.xml | 17372 | 2020-06-05 18:23:13 |
| altr-20200602_pre.xml | 10947 | 2020-06-05 18:23:13 |
| d939644d8k.htm | 37859 | 2020-06-05 18:23:13 |
| d939644d8k_htm.xml | 3247 | 2020-06-05 18:23:13 |
| d939644dex101.htm | 93279 | 2020-06-05 18:23:13 |
| FilingSummary.xml | 1725 | 2020-06-05 18:23:13 |
| Financial_Report.xlsx | 5804 | 2020-06-05 18:23:13 |
| MetaLinks.json | 18196 | 2020-06-05 18:23:13 |
| R1.htm | 38635 | 2020-06-05 18:23:13 |
| report.css | 2766 | 2020-06-05 18:23:13 |
| Show.js | 1085 | 2020-06-05 18:23:13 |