| Date Filed | Type | Description |
| 04/27/2023 |
10-K
| Annual Report for the period ended January 31, 2023 |
| 04/19/2022 |
10-K
| Annual Report for the period ended January 31, 2022 |
| 04/15/2021 |
10-K
| Annual Report for the period ended January 31, 2021 |
| 04/21/2020 |
10-K
| Annual Report for the period ended January 31, 2020 |
| 04/16/2019 |
10-K
| Annual Report for the period ended January 31, 2019 |
| 04/19/2018 |
10-K
| Annual Report for the period ended January 31, 2018 |
| 04/14/2017 |
10-K
| Annual Report for the period ended January 31, 2017 |
| 04/28/2016 |
10-K
| Annual Report for the period ended January 31, 2016 |
| 04/16/2015 |
10-K
| Annual Report for the period ended January 31, 2015 |
| 04/15/2014 |
10-K
| Annual Report for the period ended January 31, 2014 |
| 05/02/2013 |
10-K
| Annual Report for the period ended January 31, 2013 |
| 05/09/2012 |
10-K/A
| Annual Report for the period ended January 31, 2012 [amend] |
| 04/30/2012 |
10-K
| Annual Report for the period ended January 31, 2012 |
| 04/14/2011 |
10-K
| Annual Report for the period ended January 31, 2011 |
| 06/04/2010 |
10-K/A
| Annual Report for the period ended January 31, 2010 [amend] |
| 04/16/2010 |
10-K
| Annual Report for the period ended April 16, 2010 |
| 04/15/2009 |
10-K
| Annual Report for the period ended January 31, 2009 |
| 01/20/2009 |
10-K/A
| Annual Report for the period ended January 31, 2008 [amend] |
| 04/30/2008 |
10-K
| Annual Report for the period ended January 31, 2008 |
| 04/20/2007 |
10-K
| Annual Report for the period ended January 31, 2007 |
| 05/12/2006 |
10-K
| Annual Report for the period ended January 31, 2006 |
| 05/16/2005 |
10-K/A
| Annual Report for the period ended January 31, 2005 [amend] |
| 04/29/2005 |
10-K
| Annual Report for the period ended January 31, 2005 |
| 12/15/2004 |
10-K/A
| Annual Report for the period ended January 31, 2004 [amend] |
| 06/01/2004 |
10-K/A
| Annual Report for the period ended January 31, 2004 [amend] |
| 05/17/2004 |
10-K
| Annual Report for the period ended January 31, 2004 |
| 05/14/2003 |
10-K
| Annual Report for the period ended January 31, 2003 |
| 05/02/2002 |
10-K/A
| Annual Report for the period ended January 31, 2002 [amend] |
| 05/01/2002 |
10-K
| Annual Report for the period ended January 31, 2002 |
| 05/01/2001 |
10-K
| Annual Report for the period ended January 31, 2001 |
| 05/01/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 05/03/1999 |
10-K
| Annual Report for the period ended January 31, 1999 |
| 05/01/1998 |
10-K
| Annual Report for the period ended January 31, 1998 |
| 05/01/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |