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Business Segment Information Schedule of Reconciliation of Operating Earnings Before Income Taxes from Continuing Operations (Tables)
 12 Months Ended
Jan. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]  
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
Following is a reconciliation of operating earnings to earnings before income taxes from continuing operations:

($ thousands)
 
2014

 
2013

 
2012

Operating earnings
 
$
125,934

 
$
98,617

 
$
74,478

Interest expense
 
(20,445
)
 
(21,254
)
 
(22,973
)
Loss on early extinguishment of debt
 
(420
)
 
—

 
—

Interest income
 
379

 
377

 
322

Gain on sale of subsidiary
 
4,679

 
—

 
—

Earnings before income taxes from continuing operations
 
$
110,127

 
$
77,740

 
$
51,827