Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 08, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016
Business Acquisition [Line Items]
Change in estimated fair value of contingent consideration obligation				$ (8,103)
Goodwill		$ 64,105		64,105		$ 73,915
Oncura
Business Acquisition [Line Items]
Purchase price	$ 20,200
Fair value of contingent consideration at the time of acquisition	10,100	2,100		2,100		10,200
Business combination upfront cash payment	8,400
Business combination post closing adjustment	400
Relief of liabilities owed to Analogic	$ 1,300
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		(8,200)		$ (8,100)		$ 100
Business Acquisition, Goodwill Expected Tax Deductible Period				15 years
Goodwill	$ 16,400
Acquisition related charges		$ 0	$ 400	$ 0	$ 400