| Date Filed | Type | Description |
| 08/11/2023 |
10-K
| Annual Report for the period ended May 31, 2023 |
| 09/16/2022 |
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] |
| 08/23/2021 |
10-K
| Annual Report for the period ended May 31, 2021 |
| 09/28/2020 |
10-K/A
| Annual Report for the period ended May 31, 2020 [amend] |
| 08/17/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 09/24/2019 |
10-K/A
| Annual Report for the period ended May 31, 2019 [amend] |
| 08/29/2019 |
10-K
| Annual Report for the period ended May 31, 2019 |
| 08/21/2018 |
10-K
| Annual Report for the period ended May 31, 2018 |
| 08/15/2017 |
10-K
| Annual Report for the period ended May 31, 2017 |
| 07/28/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 07/30/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 08/04/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 08/08/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 09/26/2012 |
10-K/A
| Annual Report for the period ended May 31, 2012 [amend] |
| 08/06/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 08/04/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 08/09/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 08/18/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 08/19/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 09/28/2007 |
10-K/A
| Annual Report for the period ended May 31, 2007 [amend] |
| 09/14/2007 |
10-K/A
| Annual Report for the period ended May 31, 2007 [amend] |
| 08/08/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 09/12/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 08/12/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 08/19/2004 |
10-K
| Annual Report for the period ended May 31, 2004 |
| 08/18/2003 |
10-K
| Annual Report for the period ended May 31, 2003 |
| 08/14/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 08/14/2001 |
10-K
| Annual Report for the period ended May 31, 2001 |
| 08/14/2000 |
10-K
| Annual Report for the period ended May 31, 2000 |
| 08/19/1999 |
10-K
| Annual Report for the period ended May 31, 1999 |
| 08/26/1998 |
10-K
| Annual Report for the period ended May 31, 1998 |
| 08/29/1997 |
10-K
| Annual Report for the period ended May 31, 1997 |