| Date Filed | Type | Description |
| 02/28/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 02/22/2021 |
10-K
| Annual Report for the period ended December 31, 2020 |
| 02/19/2020 |
10-K
| Annual Report for the period ended December 31, 2019 |
| 02/27/2019 |
10-KT
| Form 10-KT - Transition reports [Rule 13a-10 or 15d-10]: |
| 06/27/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 06/28/2017 |
10-K
| Annual Report for the period ended April 30, 2017 |
| 06/29/2016 |
10-K
| Annual Report for the period ended April 30, 2016 |
| 06/29/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 06/30/2014 |
10-K
| Annual Report for the period ended April 30, 2014 |
| 07/01/2013 |
10-K
| Annual Report for the period ended April 30, 2013 |
| 07/16/2012 |
10-K
| Annual Report for the period ended April 30, 2012 |
| 07/14/2011 |
10-K
| Annual Report for the period ended April 30, 2011 |
| 07/14/2010 |
10-K
| Annual Report for the period ended April 30, 2010 |
| 07/14/2009 |
10-K
| Annual Report for the period ended July 14, 2009 |
| 07/14/2008 |
10-K
| Annual Report for the period ended July 14, 2008 |
| 07/16/2007 |
10-K
| Annual Report for the period ended April 30, 2007 |
| 07/14/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 07/14/2005 |
10-K
| Annual Report for the period ended April 30, 2005 |
| 07/20/2004 |
10-K
| Annual Report for the period ended April 30, 2004 |
| 07/29/2003 |
10-K
| Annual Report for the period ended April 30, 2003 |
| 07/29/2002 |
10-K
| Annual Report for the period ended April 30, 2002 |
| 08/03/2001 |
10-K405/A
| Form 10-K405/A - Annual report [Sections 13 and 15(d), S-K Item 405] [Amend] |
| 07/27/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/27/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/30/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/30/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/30/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/26/1996 |
10-K
| Annual Report for the period ended April 30, 1996 |
| 07/27/1995 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |