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(Defined Benefit Plans) (Details)
12 Months Ended
Jan. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
participants
Jan. 31, 2015
USD ($)
Jan. 31, 2014
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined benefit, number of plan participants with benefits terminated | participants   5    
Years of service required for post-retirement benefits 20 years      
Reduction in benefit obligation due to elimination of coverage   $ 1,000,000    
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Plan assets on unfunded plan $ 0   $ 0 $ 0
Amounts that will be amortized from accumulated other comprehensive income in next fiscal year (13,000)      
Recognized net loss over next fiscal year 146,000      
Amortization of prior service cost over next fiscal year (159,000)      
Expected postretirement medical and other benefit payments in fiscal 2017 329,000      
Minimum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Amount of lump sum payments based on officer's years of service to the company 8,000      
Maximum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Amount of lump sum payments based on officer's years of service to the company $ 15,000