Goodwill And Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||||||||
---|---|---|---|---|---|---|---|---|---|
Apr. 30, 2017 |
Apr. 30, 2016 |
Apr. 30, 2015 |
|||||||
Schedule Of Goodwill And Intangible Assets [Line Items] | |||||||||
Intangible assets | $ 196,400 | [1] | $ 6,600 | [2] | |||||
Amortization expense | $ 15,400 | 11,700 | $ 8,200 | ||||||
Amortizable intangible assets fully amortization year | 2031 | ||||||||
Legacy Hay | Trademarks | |||||||||
Schedule Of Goodwill And Intangible Assets [Line Items] | |||||||||
Intangible assets | 102,200 | ||||||||
Customer Lists | Legacy Hay | |||||||||
Schedule Of Goodwill And Intangible Assets [Line Items] | |||||||||
Intangible assets | $ 84,000 | ||||||||
Intangible assets, weighted-average useful lives | 11 years | ||||||||
Intellectual Property | Legacy Hay | |||||||||
Schedule Of Goodwill And Intangible Assets [Line Items] | |||||||||
Intangible assets | $ 10,200 | ||||||||
Intangible assets, weighted-average useful lives | 7 years | ||||||||
|