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Goodwill and Intangible Assets - Estimated Aggregate Amortization Expense (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Estimated aggregate future amortization expense    
2018 $ 40,307  
2019 32,919  
2020 26,336  
2021 21,212  
2022 17,171  
Thereafter 52,980  
Total 190,925 $ 160,422
Customer relationships    
Estimated aggregate future amortization expense    
2018 37,780  
2019 30,392  
2020 23,809  
2021 18,715  
2022 14,764  
Thereafter 36,445  
Total 161,905 138,597
Tradenames    
Estimated aggregate future amortization expense    
2018 1,503  
2019 1,503  
2020 1,503  
2021 1,473  
2022 1,445  
Thereafter 16,105  
Total 23,532 15,313
Vendor agreement    
Estimated aggregate future amortization expense    
2018 706  
2019 706  
2020 706  
2021 706  
2022 644  
Total 3,468 4,174
Leasehold interests    
Estimated aggregate future amortization expense    
2018 318  
2019 318  
2020 318  
2021 318  
2022 318  
Thereafter 430  
Total $ 2,020 $ 2,338