| Date Filed | Type | Description |
| 10/13/2022 |
10-K/A
| Annual Report for the period ended May 31, 2022 [amend] |
| 10/13/2022 |
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] |
| 08/31/2021 |
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] |
| 08/31/2020 |
10-K
| Annual Report for the period ended May 31, 2020 |
| 09/27/2019 |
10-K/A
| Annual Report for the period ended May 31, 2019 [amend] |
| 08/21/2019 |
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 |
| 08/05/2016 |
10-K
| Annual Report for the period ended May 31, 2016 |
| 08/12/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 08/08/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 08/14/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 08/09/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 08/09/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 07/30/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 08/04/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 08/14/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 07/31/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 08/21/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 08/29/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 08/11/2004 |
10-K
| Annual Report for the period ended May 31, 2004 |
| 08/27/2003 |
10-K
| Annual Report for the period ended May 31, 2003 |
| 08/23/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 08/24/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/23/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/30/1999 |
10-K
| Annual Report for the period ended May 31, 1999 |
| 08/31/1998 |
10-K
| Annual Report for the period ended May 31, 1998 |
| 08/27/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/30/1996 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |