| Date Filed | Type | Description |
| 09/28/2022 |
10-K/A
| Annual Report for the period ended May 31, 2022 [amend] |
| 08/15/2022 |
10-K
| Annual Report for the period ended May 31, 2022 |
| 09/28/2021 |
10-K/A
| Annual Report for the period ended May 31, 2021 [amend] |
| 07/30/2021 |
10-K
| Annual Report for the period ended May 31, 2021 |
| 08/14/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 08/14/2019 |
10-K
| Annual Report for the period ended May 31, 2019 |
| 09/28/2018 |
10-K/A
| Annual Report for the period ended May 31, 2018 [amend] |
| 07/27/2018 |
10-K
| Annual Report for the period ended May 31, 2018 |
| 07/27/2017 |
10-K/A
| Annual Report for the period ended May 31, 2017 [amend] |
| 07/19/2017 |
10-K
| Annual Report for the period ended May 31, 2017 |
| 07/19/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 07/10/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 07/10/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 08/29/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 09/28/2012 |
10-K/A
| Annual Report for the period ended May 31, 2012 [amend] |
| 08/21/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 11/03/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 08/05/2011 |
10-K/A
| Annual Report for the period ended May 31, 2010 [amend] |
| 12/03/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 08/09/2010 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 03/12/2010 |
10-K
| Annual Report for the period ended May 31, 2008 |