Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Additional Information (Detail)

v3.7.0.1
Severance and Other Restructuring Costs - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 2,147 $ 1,775    
Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges     $ 5,200  
Estimated restructuring costs 5,300   $ 5,300 $ 5,300
Severance costs $ 2,100      
DCC Labs [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges       $ 1,900