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Retirement plans Defined pension disclosure (Tables)
 12 Months Ended
Jan. 31, 2017
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]

Reconciliation of benefit obligations, plan assets and funded status of plan
2016

2015

Accumulated benefit obligations
 
 
Vested benefits
$6,500
$6,587
Accumulated benefits
$6,500
$7,020
 
 
 
Change in benefit obligation
 
 
Benefit obligation - beginning of year
$7,020
$8,129
Interest cost
278

266

Actuarial gain
(493
)
(1,115
)
Benefits paid
(305
)
(260
)
Benefit obligation - end of year
$6,500
$7,020
 
 
 
Change in plan assets
 
 
Fair value of plan assets - beginning of year
$5,883
$6,168
Actual gain (loss) on plan assets
650

(25
)
Benefits paid
(305
)
(260
)
Fair value of plan assets - end of year
$6,228
$5,883
 
 
 
Unfunded status
$(272)
$(1,137)
 
 
 
Balance sheet classification
 
 
Prepaid expenses and other current assets
$348
$326
Other assets
1,201

1,166

Deferred compensation liabilities
(1,821
)
(2,629
)
Net amount recognized
$(272)
$(1,137)
 
 
 
Amounts recognized in accumulated other comprehensive loss
 
 
Unrecognized actuarial loss
$1,472
$2,303
Net amount recognized
$1,472
$2,303