| Date Filed | Type | Description |
| 07/21/2023 |
10-K
| Annual Report for the period ended April 30, 2023 |
| 07/27/2022 |
10-K
| Annual Report for the period ended April 30, 2022 |
| 07/23/2021 |
10-K
| Annual Report for the period ended April 30, 2021 |
| 08/12/2020 |
10-K
| Annual Report for the period ended April 30, 2020 |
| 07/24/2019 |
10-K
| Annual Report for the period ended April 30, 2019 |
| 07/24/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 07/24/2017 |
10-K
| Annual Report for the period ended April 30, 2017 |
| 07/29/2016 |
10-K
| Annual Report for the period ended April 30, 2016 |
| 07/24/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 07/24/2014 |
10-K
| Annual Report for the period ended April 30, 2014 |
| 07/26/2013 |
10-K
| Annual Report for the period ended April 30, 2013 |
| 08/14/2012 |
10-K
| Annual Report for the period ended April 30, 2012 |
| 07/19/2011 |
10-K
| Annual Report for the period ended April 30, 2011 |
| 07/16/2010 |
10-K
| Annual Report for the period ended April 30, 2010 |
| 07/17/2009 |
10-K
| Annual Report for the period ended April 30, 2009 |
| 07/18/2008 |
10-K
| Annual Report for the period ended April 30, 2008 |
| 07/24/2007 |
10-K
| Annual Report for the period ended April 30, 2007 |
| 07/28/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 07/27/2005 |
10-K
| Annual Report for the period ended April 30, 2005 |
| 04/12/2005 |
10-K/A
| Annual Report for the period ended April 30, 2004 [amend] |
| 07/20/2004 |
10-K
| Annual Report for the period ended April 30, 2004 |
| 07/21/2003 |
10-K
| Annual Report for the period ended April 30, 2003 |
| 08/22/2002 |
10-K/A
| Annual Report for the period ended April 30, 2002 [amend] |
| 07/25/2002 |
10-K
| Annual Report for the period ended April 30, 2002 |
| 08/22/2001 |
10-K/A
| Annual Report for the period ended April 30, 2001 [amend] |
| 08/13/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 12/15/2000 |
10-K/A
| Annual Report for the period ended April 30, 2000 [amend] |
| 07/26/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 07/28/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 10/19/1998 |
10-K/A
| Annual Report for the period ended April 30, 1998 [amend] |
| 07/27/1998 |
10-K/A
| Annual Report for the period ended July 27, 1998 [amend] |
| 07/22/1998 |
10-K
| Annual Report for the period ended April 30, 1998 |
| 07/16/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |