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Reconciliation of Beginning and Ending Balances of Total Amounts of Gross Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Reconciliation Of Income Taxes [Line Items]      
Balance at the beginning of the period $ 7,895 $ 8,664 $ 7,758
Increases in tax positions for prior years 1,026 419 3,466
Decreases in tax positions for prior years (305) (929) (310)
Increases in tax positions for current year 521 635 360
Settlements (3,190) (13) (2,259)
Lapse in statute of limitations (1,112) (881) (351)
Balance at the end of the period $ 4,835 $ 7,895 $ 8,664