Summary of Net Accounts Receivable Greater Than or Equal to 10% of Net Account Receivable Balance (Detail) (Accounts Receivable, Credit Concentration Risk)	3 Months Ended		12 Months Ended
	Oct. 31, 2014		Jul. 31, 2014
Philips
Accounts Receivable [Line Items]
Percentage of net accounts receivable	15.00%		16.00%
L-3
Accounts Receivable [Line Items]
Percentage of net accounts receivable	14.00%		16.00%
Toshiba
Accounts Receivable [Line Items]
Percentage of net accounts receivable		[1]	11.00%

[1] Total net accounts receivable due from client was less than 10% in this period.