Quarterly report pursuant to Section 13 or 15(d)

Goodwill and intangible assets (Detail) - Schedule Of Intangible Assets

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Goodwill and intangible assets (Detail) - Schedule Of Intangible Assets (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Jul. 31, 2012
Finite-lived intangible assets, Gross $ 28,179 $ 27,904
Finite-lived intangible assets, Accumulated Amortization (17,763) (16,124)
Finite-lived intangible assets, Net 10,416 11,780
Patents [Member]
    
Finite-lived intangible assets, Gross 11,027 11,027
Finite-lived intangible assets, Accumulated Amortization (10,535) (10,439)
Finite-lived intangible assets, Net 492 588
Customer Relationships [Member]
    
Finite-lived intangible assets, Gross 12,439 12,304
Finite-lived intangible assets, Accumulated Amortization (5,185) (4,356)
Finite-lived intangible assets, Net 7,254 7,948
Website And Acquired Content [Member]
    
Finite-lived intangible assets, Gross 1,026 1,019
Finite-lived intangible assets, Accumulated Amortization (964) (874)
Finite-lived intangible assets, Net 62 145
Licensed Technology And Other [Member]
    
Finite-lived intangible assets, Gross 500 485
Finite-lived intangible assets, Accumulated Amortization (371) (300)
Finite-lived intangible assets, Net 129 185
Trademarks [Member]
    
Finite-lived intangible assets, Gross 3,187 3,069
Finite-lived intangible assets, Accumulated Amortization (708) (155)
Finite-lived intangible assets, Net $ 2,479 $ 2,914