| Date Filed | Type | Description |
| 07/26/2018 |
10-K
| Annual Report for the period ended April 30, 2018 |
| 07/27/2017 |
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 |
| 07/27/2015 |
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 |
| 07/29/2013 |
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 |
| 07/13/2011 |
10-K
| Annual Report for the period ended April 30, 2011 |
| 07/29/2010 |
10-K
| Annual Report for the period ended April 30, 2010 |
| 07/09/2009 |
10-K
| Annual Report for the period ended April 30, 2009 |
| 07/28/2008 |
10-K
| Annual Report for the period ended April 27, 2008 |
| 08/27/2007 |
10-K/A
| Annual Report for the period ended April 29, 2007 [amend] |
| 07/30/2007 |
10-K
| Annual Report for the period ended April 29, 2007 |
| 09/12/2006 |
10-K/A
| Annual Report for the period ended April 30, 2006 [amend] |
| 08/09/2006 |
10-K/A
| Annual Report for the period ended April 30, 2006 [amend] |
| 07/31/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 06/21/2005 |
10-K
| Annual Report for the period ended March 31, 2005 |
| 05/11/2005 |
10-K/A
| Annual Report for the period ended March 31, 2004 [amend] |
| 07/14/2004 |
10-K
| Annual Report for the period ended March 31, 2004 |
| 07/15/1998 |
10-K
| Annual Report for the period ended March 31, 1998 |
| 10/02/1997 |
10-K/A
| Annual Report for the period ended March 31, 1997 [amend] |
| 07/15/1997 |
10-K
| Annual Report for the period ended March 31, 1997 |
| 08/05/1996 |
10-K/A
| Annual Report for the period ended March 31, 1996 [amend] |
| 07/15/1996 |
10-K/A
| Annual Report for the period ended March 31, 1996 [amend] |
| 07/03/1996 |
10-K
| Annual Report for the period ended March 31, 1996 |