| Date Filed | Type | Description |
| 07/18/2023 |
10-K
| Annual Report for the period ended May 31, 2023 |
| 07/21/2022 |
10-K
| Annual Report for the period ended May 31, 2022 |
| 07/20/2021 |
10-K
| Annual Report for the period ended May 31, 2021 |
| 07/21/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 07/18/2019 |
10-K
| Annual Report for the period ended May 31, 2019 |
| 07/11/2018 |
10-K
| Annual Report for the period ended May 31, 2018 |
| 07/12/2017 |
10-K
| Annual Report for the period ended May 31, 2017 |
| 07/13/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 07/15/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 07/17/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 07/25/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 07/19/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 07/13/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 07/16/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 07/16/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 07/11/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 07/20/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 07/17/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 07/22/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 07/22/2005 |
AR
| 2005 Annual Report |
| 07/22/2004 |
10-K
| Annual Report for the period ended May 31, 2004 |
| 07/22/2004 |
AR
| 2004 Annual Report |
| 08/18/2003 |
10-K
| Annual Report for the period ended May 31, 2003 |
| 08/18/2003 |
AR
| 2003 Annual Report |
| 08/26/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 08/26/2002 |
AR
| 2002 Annual Report |
| 08/27/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/24/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/18/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/20/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/22/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/20/1996 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/11/1995 |
10-K
| Annual Report for the period ended May 31, 1995 |
| 08/24/1994 |
10-K
| Annual Report for the period ended May 31, 1994 |