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Revenue Recognition, Contracts with Customers, Accounts Receivable, net and Contract Liability Balances (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Jul. 31, 2019		Jul. 31, 2018	Apr. 30, 2019
Balances from contracts with customers [Abstract]
Accounts receivable, net		$ 281,055			$ 294,867
Contract liability		408,630	[1]		507,365
Contract liability (included in Other Long-Term Liabilities)		13,752
Increase/(decrease) [Abstract]
Accounts receivable, net		11,934		$ (64,053)
Contract liabilities		(103,268)		$ (67,221)
Sales return reserve recorded in contract liability		33,400			25,900
Revenue recognized from beginning contract liability					194,300
Balances without Adoption of Topic 606 [Member] | ASU 2014-09 [Member]
Balances from contracts with customers [Abstract]
Accounts receivable, net					294,867
Contract liability	[1]				507,365
Contract liability (included in Other Long-Term Liabilities)					$ 10,722
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member]
Increase/(decrease) [Abstract]
Accounts receivable, net		(13,812)
Contract liabilities	[1]	(98,735)
Contract liability (Deferred revenue) (included in Other Long-Term Liabilities)		$ 3,030
[1] The sales return reserve recorded in Contract Liability is $33.4 million and $25.9 million, as of July 31, 2019 and April 30, 2019, respectively.

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