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Stock Based Compensation - Plans (Tables)
12 Months Ended
Jan. 31, 2015
Stock Based Compensation [Abstract]  
Stock Based Compensation Plans
 1987 2004 2013  
 Plan Plan Plan Total
Options and/or restricted stock initially authorized5,850,000 1,350,000 1,500,000 8,700,000
Options and/or restricted stock available for grant:       
February 1, 20140 0 1,488,902 1,488,902
January 31, 20150 0 1,287,396 1,287,396