Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Detail) - Intangible assets

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Goodwill and intangible assets (Detail) - Intangible assets (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Finite-lived intangible assets, Gross $ 28,351 $ 27,904
Finite-lived intangible assets, Accumulated Amortization (17,377) (16,124)
Finite-lived intangible assets, Net 10,974 11,780
Patents [Member]
    
Finite-lived intangible assets, Gross 11,027 11,027
Finite-lived intangible assets, Accumulated Amortization (10,504) (10,439)
Finite-lived intangible assets, Net 523 588
Customer Relationships [Member]
    
Finite-lived intangible assets, Gross 12,543 12,304
Finite-lived intangible assets, Accumulated Amortization (4,969) (4,356)
Finite-lived intangible assets, Net 7,574 7,948
Website And Acquired Content [Member]
    
Finite-lived intangible assets, Gross 1,032 1,019
Finite-lived intangible assets, Accumulated Amortization (942) (874)
Finite-lived intangible assets, Net 90 145
Licensed Technology And Other [Member]
    
Finite-lived intangible assets, Gross 487 485
Finite-lived intangible assets, Accumulated Amortization (351) (300)
Finite-lived intangible assets, Net 136 185
Trademarks [Member]
    
Finite-lived intangible assets, Gross 3,262 3,069
Finite-lived intangible assets, Accumulated Amortization (611) (155)
Finite-lived intangible assets, Net $ 2,651 $ 2,914