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Intangibles
3 Months Ended
Jul. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
The components of customer relationship intangibles were:
 July 31,April 30,
(in thousands)20222022
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(209,306)(197,889)
Total$64,694 $76,111 

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, 2022 and 2021 was $11.4 million and $11.4 million, respectively,