Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Additional Information (Detail)

v3.5.0.2
Goodwill and Intangible Assets - Additional Information (Detail) - DCC Labs [Member] - USD ($)
3 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Goodwill And Intangible Assets [Line Items]      
Goodwill   $ 5,400,000  
Minimum [Member]      
Goodwill And Intangible Assets [Line Items]      
Excess fair value amount over and above the carrying value of the net assets     $ 15,400,000
Excess fair value percentage over and above the carrying value of the net assets     15.00%
Maximum [Member]      
Goodwill And Intangible Assets [Line Items]      
Excess fair value amount over and above the carrying value of the net assets     $ 25,000,000
Excess fair value percentage over and above the carrying value of the net assets     24.40%
Scenario, Forecast [Member] | Minimum [Member]      
Goodwill And Intangible Assets [Line Items]      
Goodwill, Impairment charges $ 0    
Scenario, Forecast [Member] | Maximum [Member]      
Goodwill And Intangible Assets [Line Items]      
Goodwill, Impairment charges $ 45,700,000