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
Oct. 31, 2012
Jul. 31, 2012
Finite-lived intangible assets, Gross $ 28,218 $ 27,904
Finite-lived intangible assets, Accumulated Amortization (16,798) (16,124)
Finite-lived intangible assets, Net 11,420 11,780
Patents [Member]
    
Finite-lived intangible assets, Gross 11,027 11,027
Finite-lived intangible assets, Accumulated Amortization (10,472) (10,439)
Finite-lived intangible assets, Net 555 588
Customer Relationships [Member]
    
Finite-lived intangible assets, Gross 12,474 12,304
Finite-lived intangible assets, Accumulated Amortization (4,680) (4,356)
Finite-lived intangible assets, Net 7,794 7,948
Website And Acquired Content [Member]
    
Finite-lived intangible assets, Gross 1,029 1,019
Finite-lived intangible assets, Accumulated Amortization (911) (874)
Finite-lived intangible assets, Net 118 145
Licensed Technology And Other [Member]
    
Finite-lived intangible assets, Gross 491 485
Finite-lived intangible assets, Accumulated Amortization (330) (300)
Finite-lived intangible assets, Net 161 185
Trademarks [Member]
    
Finite-lived intangible assets, Gross 3,197 3,069
Finite-lived intangible assets, Accumulated Amortization (405) (155)
Finite-lived intangible assets, Net $ 2,792 $ 2,914