| Date Filed | Type | Description |
| 07/17/2023 |
10-K
| Annual Report for the period ended May 31, 2023 |
| 07/18/2022 |
10-K
| Annual Report for the period ended May 31, 2022 |
| 07/19/2021 |
10-K
| Annual Report for the period ended May 31, 2021 |
| 07/20/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 08/15/2019 |
10-K/A
| Annual Report for the period ended May 31, 2019 [amend] |
| 07/16/2019 |
10-K
| Annual Report for the period ended May 31, 2019 |
| 07/16/2018 |
10-K
| Annual Report for the period ended May 31, 2018 |
| 07/17/2017 |
10-K
| Annual Report for the period ended May 31, 2017 |
| 07/18/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 07/14/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 07/14/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 07/15/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 07/16/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 07/12/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 07/15/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 07/15/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 07/16/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 07/12/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 08/02/2006 |
10-K/A
| Annual Report for the period ended May 31, 2006 [amend] |
| 07/14/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 07/14/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 07/21/2004 |
10-K/A
| Annual Report for the period ended May 31, 2004 [amend] |
| 07/16/2004 |
10-K
| Annual Report for the period ended May 31, 2004 |
| 07/17/2003 |
10-K
| Annual Report for the period ended May 31, 2003 |
| 07/22/2002 |
10-K/A
| Annual Report for the period ended May 31, 2002 [amend] |
| 07/19/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 07/24/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/02/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/16/1999 |
10-K
| Annual Report for the period ended May 31, 1999 |
| 08/14/1998 |
10-K
| Annual Report for the period ended May 31, 1998 |