Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 08, 2016	Oct. 31, 2015	Jul. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 73,791			$ 57,450
Oncura
Business Acquisition [Line Items]
Cash			$ 400
Accounts receivable			300
Inventory			100
Other assets			400
Property, plant, and equipment			200
Goodwill			16,300
Intangible assets			4,100
Total assets acquired			21,800
Accounts payable and accrued expenses			(1,600)
Deferred revenue			(900)
Total liabilities assumed			(2,500)
Total purchase price		$ 19,300	19,300
Oncura | Customer relationships
Business Acquisition [Line Items]
Intangible assets			3,100
Oncura | Trade names
Business Acquisition [Line Items]
Intangible assets			$ 1,000