Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Net Amount	$ 1,378
Merger with Credence Systems Corporation (August 29, 2008)
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,300	27,300
Accumulated Amortization	25,922	25,729
Net Amount	1,378	1,571
Merger with Credence Systems Corporation (August 29, 2008) | Developed Technology Rights | Asl
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	6 years	6 years
Gross Carrying Amount	16,000	16,000
Accumulated Amortization	15,803	15,737
Net Amount	197	263
Merger with Credence Systems Corporation (August 29, 2008) | Developed Technology Rights | Diamond
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	9 years	9 years
Gross Carrying Amount	9,400	9,400
Accumulated Amortization	8,965	8,906
Net Amount	435	494
Merger with Credence Systems Corporation (August 29, 2008) | Maintenance agreements
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life	7 years	7 years
Gross Carrying Amount	1,900	1,900
Accumulated Amortization	1,154	1,086
Net Amount	$ 746	$ 814