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Retirement plans Amounts recognized in other comprehensive income (Tables)
12 Months Ended
Jan. 31, 2018
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Amounts recognized in other comprehensive income (in thousands)
 
 
Actuarial (loss) gain on obligation
($249)
$493
Actual gain on plan assets
414

338

Total in other comprehensive income
$165
$831