| Date Filed | Type | Description |
| 04/17/2023 |
10-K
| Annual Report for the period ended January 31, 2023 |
| 04/18/2022 |
10-K
| Annual Report for the period ended January 31, 2022 |
| 04/13/2021 |
10-K
| Annual Report for the period ended January 31, 2021 |
| 04/10/2020 |
10-K
| Annual Report for the period ended January 31, 2020 |
| 04/10/2019 |
10-K
| Annual Report for the period ended January 31, 2019 |
| 04/10/2018 |
10-K
| Annual Report for the period ended January 31, 2018 |
| 04/06/2017 |
10-K
| Annual Report for the period ended January 31, 2017 |
| 04/08/2016 |
10-K
| Annual Report for the period ended January 31, 2016 |
| 04/08/2015 |
10-K
| Annual Report for the period ended January 31, 2015 |
| 04/07/2014 |
10-K
| Annual Report for the period ended January 31, 2014 |
| 04/08/2013 |
10-K
| Annual Report for the period ended January 31, 2013 |
| 04/04/2012 |
10-K
| Annual Report for the period ended January 31, 2012 |
| 04/18/2011 |
10-K
| Annual Report for the period ended January 31, 2011 |
| 04/09/2010 |
10-K
| Annual Report for the period ended January 31, 2010 |
| 04/13/2009 |
10-K
| Annual Report for the period ended January 31, 2009 |
| 05/29/2008 |
10-K/A
| Annual Report for the period ended January 31, 2008 [amend] |
| 04/16/2008 |
10-K
| Annual Report for the period ended January 31, 2008 |
| 04/16/2007 |
10-K
| Annual Report for the period ended January 31, 2007 |
| 04/14/2006 |
10-K
| Annual Report for the period ended January 31, 2006 |
| 04/20/2005 |
10-K
| Annual Report for the period ended January 31, 2005 |
| 04/09/2004 |
10-K
| Annual Report for the period ended January 31, 2004 |
| 04/11/2003 |
10-K
| Annual Report for the period ended January 31, 2003 |
| 04/10/2002 |
10-K
| Annual Report for the period ended January 31, 2002 |
| 04/18/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/17/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/21/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/20/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/22/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 05/31/1996 |
10-K/A
| Annual Report for the period ended January 31, 1996 [amend] |
| 04/15/1996 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/10/1995 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |