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Derivative Instruments (Tables)
 3 Months Ended
Apr. 30, 2016
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Our outstanding derivative instrument contracts for the first quarter of 2016 were comprised of the following:
 
First Quarter
(In thousands)
2016
Diesel fuel collars (in gallons)
7,225
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The fair value of our outstanding derivative instrument contracts was as follows:
(In thousands)
 
Assets (Liabilities)
Derivative Instrument
Balance Sheet Location
April 30, 2016
 
January 30, 2016
Diesel fuel collars
Other current assets
$
41

 
$
78

 
Other assets
767

 
794

 
Accrued operating expenses
(1,668
)
 
(2,799
)
 
Other liabilities
(2,325
)
 
(2,738
)
Total derivative instruments
 
$
(3,185
)
 
$
(4,665
)
Derivative Instruments, Gain (Loss) [Table Text Block]
The effect of derivative instruments on the consolidated statements of operations was as follows:
 
 
Amount of Gain (Loss)
(In thousands)
 
First Quarter
Derivative Instrument
Statements of Operations Location
2016
 
2015
Diesel fuel collars
 
 
 
 
Realized
Other income (expense)
$
(510
)
 
$
—

Unrealized
Other income (expense)
1,480

 
28

Total derivative instruments
 
$
970

 
$
28