Annual report pursuant to Section 13 and 15(d)

Restructuring Charges, Net - Additional Information (Detail)

v3.19.2
Restructuring Charges, Net - Additional Information (Detail) - USD ($)
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Restructuring Cost And Reserve [Line Items]      
Restructuring charges, net $ 0 $ 78,000 $ 34,600,000
Facilities      
Restructuring Cost And Reserve [Line Items]      
Restructuring charges, net   $ 100,000 18,600,000
Severance      
Restructuring Cost And Reserve [Line Items]      
Restructuring charges, net     $ 16,000,000