| Date Filed | Type | Description |
| 05/21/2020 |
10-K/A
| Annual Report for the period ended January 31, 2020 [amend] |
| 03/25/2020 |
10-K
| Annual Report for the period ended January 31, 2020 |
| 03/20/2019 |
10-K
| Annual Report for the period ended January 31, 2019 |
| 03/22/2018 |
10-K
| Annual Report for the period ended January 31, 2018 |
| 03/30/2017 |
10-K
| Annual Report for the period ended January 31, 2017 |
| 03/24/2016 |
10-K
| Annual Report for the period ended January 31, 2016 |
| 03/26/2015 |
10-K
| Annual Report for the period ended January 31, 2015 |
| 04/08/2014 |
10-K
| Annual Report for the period ended January 31, 2014 |
| 02/05/2014 |
10-K
| Annual Report for the period ended January 31, 2013 |
| 03/21/2012 |
10-K
| Annual Report for the period ended January 31, 2012 |
| 03/23/2011 |
10-K
| Annual Report for the period ended January 31, 2011 |
| 03/24/2010 |
10-K
| Annual Report for the period ended January 31, 2010 |
| 03/26/2009 |
10-K
| Annual Report for the period ended January 31, 2009 |
| 03/28/2008 |
10-K
| Annual Report for the period ended January 31, 2008 |
| 03/30/2007 |
10-K
| Annual Report for the period ended January 31, 2007 |
| 04/03/2006 |
10-K
| Annual Report for the period ended January 31, 2006 |
| 04/01/2005 |
10-K
| Annual Report for the period ended January 31, 2005 |
| 04/06/2004 |
10-K
| Annual Report for the period ended January 31, 2004 |
| 04/24/2003 |
10-K
| Annual Report for the period ended January 31, 2003 |
| 04/24/2002 |
10-K
| Annual Report for the period ended January 31, 2002 |
| 04/27/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 06/01/2000 |
10-K405/A
| Form 10-K405/A - Annual report [Sections 13 and 15(d), S-K Item 405] [Amend] |
| 05/01/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 06/01/1999 |
10-K405/A
| Form 10-K405/A - Annual report [Sections 13 and 15(d), S-K Item 405] [Amend] |
| 05/03/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 05/29/1998 |
10-K405/A
| Form 10-K405/A - Annual report [Sections 13 and 15(d), S-K Item 405] [Amend] |
| 04/08/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/29/1997 |
10-K/A
| Annual Report for the period ended January 31, 1997 [amend] |
| 04/10/1997 |
10-K
| Annual Report for the period ended January 31, 1997 |
| 04/23/1996 |
10-K
| Annual Report for the period ended January 31, 1996 |