| Date Filed | Type | Description |
| 06/29/2022 |
10-K
| Annual Report for the period ended April 30, 2022 |
| 06/29/2021 |
10-K
| Annual Report for the period ended April 30, 2021 |
| 06/30/2020 |
10-K
| Annual Report for the period ended April 30, 2020 |
| 06/27/2019 |
10-K
| Annual Report for the period ended April 30, 2019 |
| 07/16/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 08/28/2017 |
10-K/A
| Annual Report for the period ended April 30, 2017 [amend] |
| 07/14/2017 |
10-K
| Annual Report for the period ended April 30, 2017 |
| 07/14/2016 |
10-K
| Annual Report for the period ended April 30, 2016 |
| 07/14/2015 |
10-K
| Annual Report for the period ended April 30, 2015 |
| 07/14/2014 |
10-K
| Annual Report for the period ended April 30, 2014 |
| 07/11/2013 |
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 |
| 08/07/2009 |
10-K/A
| Annual Report for the period ended April 30, 2009 [amend] |
| 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 |
| 07/11/2007 |
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 |
| 07/14/2004 |
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 |
| 03/21/2003 |
10-K/A
| Annual Report for the period ended April 30, 2002 [amend] |
| 08/13/2002 |
10-K/A
| Annual Report for the period ended April 30, 2002 [amend] |
| 08/13/2002 |
10-K
| Annual Report for the period ended April 30, 2002 |
| 07/27/2001 |
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 |
| 01/28/2000 |
10-K/A
| Annual Report for the period ended April 30, 1999 [amend] |
| 07/28/1999 |
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 |
| 10/14/1997 |
10-K/A
| Annual Report for the period ended June 30, 1997 [amend] |
| 10/02/1997 |
10-K/A
| Annual Report for the period ended April 30, 1997 [amend] |
| 07/29/1997 |
10-K
| Annual Report for the period ended April 30, 1997 |
| 03/05/1997 |
10-K/A
| Annual Report for the period ended April 30, 1996 [amend] |
|