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Intangibles
9 Months Ended
Jan. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
The components of customer relationship intangibles were:
 January 31,April 30,
(in thousands)20232022
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(232,139)(197,889)
Total$41,861 $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 January 31, 2023 and 2022 was $11.4 million and $11.4 million, respectively, and $34.2 million and $34.2 million, respectively, for each of the nine month periods ended January 31, 2023 and 2022.