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Retirement plans Defined pension disclosure (Tables)
 12 Months Ended
Jan. 31, 2016
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
2015

2014

Accumulated benefit obligations
 
 
Vested benefits
$6,587
$7,626
Accumulated benefits
$7,020
$8,129
 
 
 
Change in benefit obligation
 
 
Benefit obligation - beginning of year
$8,129
$6,827
Service cost
—

—

Interest cost
266

299

Actuarial (gain) loss
(1,115
)
1,249

Benefits paid
(260
)
(246
)
Benefit obligation - end of year
$7,020
$8,129
 
 
 
Change in plan assets
 
 
Fair value of plan assets - beginning of year
$6,168
$6,351
Actual (gain) loss on plan assets
(25
)
63

Benefits paid
(260
)
(246
)
Fair value of plan assets - end of year
$5,883
$6,168
 
 
 
Unfunded status
$(1,137)
$(1,961)
 
 
 
Balance sheet classification
 
 
Current assets
$326
$352
Other assets
1,166

1,163

Other long-term liabilities
(2,629
)
(3,476
)
Net amount recognized
$(1,137)
$(1,961)
 
 
 
Amounts recognized in accumulated other comprehensive loss
 
 
Unrecognized actuarial loss
$2,303
$3,124
Net amount recognized
$2,303
$3,124