Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 08, 2016	Jan. 31, 2016	Jan. 31, 2016	Jan. 31, 2015	Oct. 31, 2015
Business Acquisition [Line Items]
Fair value of contingent consideration obligation				$ (62)
Oncura
Business Acquisition [Line Items]
Purchase price	$ 19,300				$ 19,300
Fair value of contingent consideration	11,300
Business combination upfront cash payment	8,400
Business combination post closing adjustment	(400)
Fair value of contingent consideration obligation	$ 11,300	$ 11,300	$ 11,300
Business Acquisition Contingent Consideration Payment Period	4 years
Business Acquisition Contingent Consideration Payment Start Date	May 01, 2016
Business Acquisition, Goodwill Expected Tax Deductible Period			15 years
Acquisition related charges		$ 400	$ 400