| Date Filed | Type | Description |
| 07/28/2023 |
10-K
| Annual Report for the period ended April 30, 2023 |
| 07/26/2022 |
10-K
| Annual Report for the period ended April 30, 2022 |
| 07/28/2021 |
10-K
| Annual Report for the period ended April 30, 2021 |
| 07/28/2020 |
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 |
| 07/26/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 07/26/2017 |
10-K
| Annual Report for the period ended April 30, 2017 |
| 07/15/2016 |
10-K
| Annual Report for the period ended April 30, 2016 |
| 07/22/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 07/21/2014 |
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 |
| 07/27/2012 |
10-K
| Annual Report for the period ended April 30, 2012 |
| 07/29/2011 |
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 |
| 07/16/2009 |
10-K
| Annual Report for the period ended April 30, 2009 |
| 06/08/2009 |
10-K/A
| Annual Report for the period ended April 30, 2008 [amend] |
| 07/17/2008 |
10-K
| Annual Report for the period ended April 30, 2008 |
| 07/20/2007 |
10-K
| Annual Report for the period ended April 30, 2007 |
| 08/18/2006 |
10-K/A
| Annual Report for the period ended April 30, 2006 [amend] |
| 07/28/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 08/26/2005 |
10-K/A
| Annual Report for the period ended April 30, 2005 [amend] |
| 07/29/2005 |
10-K
| Annual Report for the period ended April 30, 2005 |
| 02/28/2005 |
10-K/A
| Annual Report for the period ended April 30, 2004 [amend] |
| 07/28/2004 |
10-K
| Annual Report for the period ended April 30, 2004 |
| 07/25/2003 |
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] |
| 07/29/2002 |
10-K
| Annual Report for the period ended April 30, 2002 |
| 03/26/2002 |
10-K/A
| Annual Report for the period ended April 30, 2001 [amend] |
| 08/17/2001 |
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 |
| 08/31/2000 |
10-K/A
| Annual Report for the period ended April 30, 2000 [amend] |
| 07/28/2000 |
10-K
| Annual Report for the period ended April 30, 2000 |
| 08/27/1999 |
10-K/A
| Annual Report for the period ended April 30, 1999 [amend] |
| 08/27/1999 |
10-K/A
| Annual Report for the period ended April 30, 1999 [amend] |
|