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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Jan. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
The components of accumulated other comprehensive income (loss)
The components of accumulated other comprehensive income (loss) are shown below:
 
 
As of January 31,
 
 
2013
 
2012
 
2011
Foreign currency translation
 
$
142

 
$
145

 
$
183

Postretirement benefits, net of tax
 
(2,237
)
 
(2,107
)
 
(1,303
)
Total accumulated other comprehensive loss
 
$
(2,095
)
 
$
(1,962
)
 
$
(1,120
)