Business Combination - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 08, 2016	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2017
Business Acquisition [Line Items]
Change in estimated fair value of contingent consideration obligation		$ (10,239,000)	$ 141,000	$ (62,000)
Goodwill		2,344,000	73,915,000
Oncura
Business Acquisition [Line Items]
Purchase price	$ 20,200,000
Fair value of contingent consideration	10,100,000	0	10,200,000		$ 0
Business combination upfront cash payment	8,400,000
Business combination post closing adjustment	400,000
Relief of liabilities owed to Analogic	$ 1,300,000
Business Acquisition Contingent Consideration Payment Period	4 years
Business Acquisition Contingent Consideration Payment Start Date	May 01, 2016
Change in estimated fair value of contingent consideration obligation		(10,200,000)	100,000
Goodwill	$ 16,400,000				$ 0
Business Acquisition, Goodwill Expected Tax Deductible Period	15 years
Goodwill impairment charges		16,400,000
Acquisition related charges		$ 0	$ 400,000