Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jul. 31, 2016	Jan. 08, 2016
Business Acquisition [Line Items]
Goodwill	$ 64,105	$ 73,915
Oncura
Business Acquisition [Line Items]
Cash			$ 400
Accounts receivable			300
Inventory			200
Other assets			400
Property, plant, and equipment			400
Goodwill			16,400
Intangible assets			4,100
Total assets acquired			22,200
Accounts payable and accrued expenses			(900)
Deferred revenue			(1,100)
Total liabilities assumed			(2,000)
Total purchase price			20,200
Oncura | Trade names
Business Acquisition [Line Items]
Intangible assets			1,000
Oncura | Customer relationships
Business Acquisition [Line Items]
Intangible assets			$ 3,100