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Stock Based Compensation - Plans - (Details) - shares
Aug. 01, 2015
Jan. 31, 2015
1987 Plan    
Restricted Shares Authorized And Available For Grant    
Options And/Or Restrcited Stock Initially Authorized 5,850,000  
Options And Or Restricted Stock Available For Grant 0 0
2004 Plan    
Restricted Shares Authorized And Available For Grant    
Options And/Or Restrcited Stock Initially Authorized 1,350,000  
Options And Or Restricted Stock Available For Grant 0 0
2013 Plan    
Restricted Shares Authorized And Available For Grant    
Options And/Or Restrcited Stock Initially Authorized 1,500,000  
Options And Or Restricted Stock Available For Grant 1,128,599 1,287,396