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Intangibles
 9 Months Ended
Jan. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
The components of customer relationship intangibles were:
 January 31,April 30,
(in thousands)20242023
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(274,000)(243,556)
Total$— $30,444 

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, 2024 and 2023 was $7.6 million and $11.4 million, respectively and $30.4 million and $34.2 million, respectively, for each of the nine-month periods ended January 31, 2024 and 2023.