Annual report pursuant to Section 13 and 15(d)

Commitments (Detail)

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Commitments (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Description Of Operating Leases The Company leases equipment, office and laboratory space under several non-cancelable operating leases that expire between August 2011 and May 2020. Certain leases include renewal options and rent escalation clauses. An entity owned by certain executive officers/directors of the Company owns the building that the Company leases as its main facility for laboratory operations and certain research operations. In March 2005, the Company amended and extended the lease for another 12 years. In addition to the minimum annual rentals of space, the lease is subject to annual increases, based on the consumer price index. Annual increases are limited to 3% per year.    
Rent expense Including Real Estate Taxes $ 1,556 $ 1,509 $ 1,470
Operating Leases, Rent Expense 4,378 4,023 4,076
Operating Leases, Rent Expense, Sublease Rentals 424    
Other Commitment, Due in Next Twelve Months $ 1,135