| Date Filed | Type | Description |
| 07/21/2023 |
10-K
| Annual Report for the period ended May 31, 2023 |
| 07/22/2022 |
10-K
| Annual Report for the period ended May 31, 2022 |
| 07/23/2021 |
10-K
| Annual Report for the period ended May 31, 2021 |
| 07/27/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 07/29/2019 |
10-K
| Annual Report for the period ended May 31, 2019 |
| 07/25/2018 |
10-K
| Annual Report for the period ended May 31, 2018 |
| 07/24/2017 |
10-K
| Annual Report for the period ended May 31, 2017 |
| 07/26/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 07/29/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 07/29/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 07/29/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 07/26/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 07/27/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 07/26/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 07/30/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 03/13/2009 |
10-K/A
| Annual Report for the period ended May 31, 2008 [amend] |
| 07/30/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 07/30/2008 |
AR
| 2008 Annual Report |
| 07/30/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 07/30/2007 |
AR
| 2007 Annual Report |
| 08/08/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 08/08/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 08/02/2004 |
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 |
| 08/22/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 08/24/2001 |
10-K
| Annual Report for the period ended May 31, 2001 |
| 08/25/2000 |
10-K
| Annual Report for the period ended May 31, 2000 |
| 08/23/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/26/1998 |
10-K
| Annual Report for the period ended May 31, 1998 |
| 08/26/1997 |
10-K
| Annual Report for the period ended May 31, 1997 |
| 08/23/1996 |
10-K
| Annual Report for the period ended May 31, 1996 |