| Date Filed | Type | Description |
| 07/25/2023 |
10-K
| Annual Report for the period ended April 30, 2023 |
| 07/21/2022 |
10-K
| Annual Report for the period ended April 30, 2022 |
| 07/27/2021 |
10-K
| Annual Report for the period ended April 30, 2021 |
| 07/24/2020 |
10-K
| Annual Report for the period ended April 30, 2020 |
| 07/26/2019 |
10-K
| Annual Report for the period ended April 30, 2019 |
| 07/20/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 07/18/2017 |
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 |
| 07/29/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 07/29/2014 |
10-K
| Annual Report for the period ended April 30, 2014 |
| 07/16/2013 |
10-K
| Annual Report for the period ended April 30, 2013 |
| 07/26/2012 |
10-K
| Annual Report for the period ended April 30, 2012 |
| 07/21/2011 |
10-K
| Annual Report for the period ended April 30, 2011 |
| 07/21/2010 |
10-K
| Annual Report for the period ended April 30, 2010 |
| 07/14/2009 |
10-K
| Annual Report for the period ended April 30, 2009 |
| 07/14/2008 |
10-K
| Annual Report for the period ended April 30, 2008 |
| 07/16/2007 |
10-K
| Annual Report for the period ended April 30, 2007 |
| 07/27/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 08/03/2005 |
10-K/A
| Annual Report for the period ended April 30, 2005 [amend] |
| 07/28/2005 |
10-K
| Annual Report for the period ended April 30, 2005 |
| 07/23/2004 |
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 |
| 08/14/2001 |
10-K/A
| Annual Report for the period ended April 30, 2001 [amend] |
| 07/30/2001 |
10-K
| Annual Report for the period ended April 30, 2001 |
| 07/31/2000 |
10-K
| Annual Report for the period ended April 30, 2000 |
| 07/29/1999 |
10-K
| Annual Report for the period ended April 30, 1999 |
| 07/29/1998 |
10-K
| Annual Report for the period ended April 30, 1998 |
| 07/29/1997 |
10-K
| Annual Report for the period ended April 30, 1997 |
| 07/29/1996 |
10-K
| Annual Report for the period ended April 30, 1996 |
| 08/25/1995 |
10-K/A
| Annual Report for the period ended April 30, 1995 [amend] |
| 07/28/1995 |
10-K
| Annual Report for the period ended April 30, 1995 |
| 07/29/1994 |
10-K
| Annual Report for the period ended April 30, 1994 |