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Supplemental Cash Flow Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Schedule of Cash Flow, Supplemental      
Interest $ 12,225 $ 11,981 $ 14,686
Income taxes 11,871 10,777 8,707
Frontline
     
Schedule of Cash Flow, Supplemental      
Returns received on investment $ 5,500 $ 6,250 $ 7,015