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Intangible Assets and Trademarks
 12 Months Ended
Apr. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Trademarks Customer Relationships Intangibles
 
The components of customer relationships intangibles were:
 APRIL 30
(in thousands)20222021
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(197,889)(152,222)
Total$76,111 $121,778 

Customer relationships intangibles are amortized over the estimated useful lives on a straight-line basis over six years. Amortization expense on customer relationships intangibles amounted to $45.7 million for the year ended April 30, 2022. Amortization expense on customer relationships intangibles and trademarks amounted to $47.9 million for the year ended April 30, 2021.