Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Intangible Assets (Detail)

v3.19.2
Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Intangible Assets [Line Items]    
Amortized intangible assets, Gross $ 167,351 $ 167,351
Amortized intangible assets, Accumulated Amortization (84,329) (70,847)
Amortized intangible assets, Net 83,022 96,504
Exchange rate fluctuations (74) 712
Total Intangible assets 82,948 203,216
Customer Lists    
Intangible Assets [Line Items]    
Amortized intangible assets, Gross 125,099 125,099
Amortized intangible assets, Accumulated Amortization (53,352) (42,248)
Amortized intangible assets, Net 71,747 82,851
Intellectual Property    
Intangible Assets [Line Items]    
Amortized intangible assets, Gross 33,100 33,100
Amortized intangible assets, Accumulated Amortization (22,045) (20,112)
Amortized intangible assets, Net 11,055 12,988
Database Rights    
Intangible Assets [Line Items]    
Amortized intangible assets, Gross 4,256 4,256
Amortized intangible assets, Accumulated Amortization (4,053) (3,628)
Amortized intangible assets, Net 203 628
Non-compete Agreements    
Intangible Assets [Line Items]    
Amortized intangible assets, Gross 910 910
Amortized intangible assets, Accumulated Amortization (893) (873)
Amortized intangible assets, Net 17 37
Trademarks    
Intangible Assets [Line Items]    
Amortized intangible assets, Gross 3,986 3,986
Amortized intangible assets, Accumulated Amortization $ (3,986) (3,986)
Unamortized intangible assets   $ 106,000