| Date Filed | Type | Description |
| 04/20/2018 |
10-K/A
| Annual Report for the period ended January 31, 2018 [amend] |
| 04/10/2018 |
10-K
| Annual Report for the period ended January 31, 2018 |
| 04/10/2017 |
10-K
| Annual Report for the period ended January 31, 2017 |
| 04/12/2016 |
10-K
| Annual Report for the period ended January 31, 2016 |
| 04/13/2015 |
10-K
| Annual Report for the period ended January 31, 2015 |
| 05/01/2014 |
10-K
| Annual Report for the period ended January 31, 2014 |
| 04/16/2013 |
10-K
| Annual Report for the period ended January 31, 2013 |
| 04/27/2012 |
10-K
| Annual Report for the period ended January 31, 2012 |
| 04/15/2011 |
10-K
| Annual Report for the period ended January 31, 2011 |
| 04/02/2010 |
10-K
| Annual Report for the period ended January 31, 2010 |
| 03/31/2009 |
10-K
| Annual Report for the period ended January 31, 2009 |
| 04/15/2008 |
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 |
| 04/17/2006 |
10-K
| Annual Report for the period ended January 31, 2006 |
| 11/23/2005 |
10-K/A
| Annual Report for the period ended January 31, 2005 [amend] |
| 10/31/2005 |
10-K/A
| Annual Report for the period ended January 31, 2005 [amend] |
| 04/18/2005 |
10-K
| Annual Report for the period ended January 31, 2005 |
| 04/19/2004 |
10-K/A
| Annual Report for the period ended January 31, 2004 [amend] |
| 04/14/2004 |
10-K
| Annual Report for the period ended January 31, 2004 |
| 04/07/2003 |
10-K
| Annual Report for the period ended January 31, 2003 |
| 04/04/2002 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/04/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 04/28/2000 |
10-K
| Annual Report for the period ended January 31, 2000 |
| 04/23/1999 |
10-K
| Annual Report for the period ended January 31, 1999 |
| 04/30/1998 |
10-K
| Annual Report for the period ended January 31, 1998 |
| 06/19/1997 |
10-K/A
| Annual Report for the period ended January 31, 1997 [amend] |
| 04/22/1997 |
10-K
| Annual Report for the period ended January 31, 1997 |