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Intangibles
 3 Months Ended
Jul. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
The customer relationship intangibles were:
 July 31,April 30,
(in thousands)20212021
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(163,639)(152,222)
Total$110,361 $121,778 

Customer relationship intangibles are amortized over the estimated useful lives on a straight-line basis over six years. Amortization expense for the three-month periods ended July 31, 2021 and 2020 was $11.4 million and $12.3 million, respectively.