Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Intangible assets
Amortization expense	$ 15,700	$ 14,535	$ 30,489	$ 28,805
Tradenames	61,400		61,400		$ 61,400
Depreciation and amortization expense
Intangible assets
Amortization expense	$ 15,700	$ 14,500	$ 30,500	$ 28,800

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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