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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, 2013
Jan. 31, 2012
Jan. 31, 2011
Reconciliation Of Income Taxes [Line Items]      
Balance at the beginning of the period $ 8,664 $ 7,758 $ 7,532
Increases in tax positions for prior years 419 3,466 43
Decreases in tax positions for prior years (929) (310) (592)
Increases in tax positions for current year 635 360 1,000
Settlements (13) (2,259) (40)
Lapse in statute of limitations (881) (351) (185)
Balance at the end of the period $ 7,895 $ 8,664 $ 7,758