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Intangibles
 3 Months Ended
Jul. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangibles Intangibles
The components of customer relationship intangibles were:
 July 31,April 30,
(in thousands)20202020
Customer relationship intangibles$274,000 $274,000 
Less accumulated amortization(117,972)(106,556)
Total$156,028 $167,444 

The components of trademarks were:
 July 31,April 30,
(in thousands)20202020
Trademarks$10,000 $10,000 
Less accumulated amortization(8,611)(7,778)
Total$1,389 $2,222 
Customer relationship intangibles and trademarks are amortized over the estimated useful lives on a straight-line basis over six and three years, respectively. Amortization expense for each of the three month periods ended July 31, 2020 and 2019 was $12.3 million.