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Other Expense, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Other Income and Expenses [Abstract]      
Interest income $ 4,855 $ 2,960 $ 1,992
Interest expense (31,932) (31,060) (19,618)
Gain from sale of cost method investment 3,220 0 0
Other income (expense) (385) (2,170) 77
Other expense, net $ (24,242) $ (30,270) $ (17,549)