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Revenue Recognition, Contracts with Customers, Accounts Receivable, net and Contract Liability (Deferred Revenue) Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Balances from contracts with customers [Abstract] |  |  |  |  |
Accounts receivable, net |  | $ 294,867 | [1] | $ 212,377 |
Contract liability (Deferred revenue) |  | 507,365 | [1] | 486,353 |
Contract liability (Deferred revenue) (included in Other Long-Term Liabilities) |  | 10,722 |  |  |
Increase/(decrease) [Abstract] |  |  |  |  |
Accounts receivable, net |  | (52,939) |  | (14,209) | $ (29,886)
Contract liability (Deferred revenue) |  | 18,106 |  | 36,243 | $ 22,692
Sales return reserve recorded in contract liability |  | 25,900 |  |  |
Revenue recognized from beginning contract liability |  | 530,400 |  |  |
Balances without Adoption of Topic 606 [Member] | ASU 2014-09 [Member] |  |  |  |  |
Balances from contracts with customers [Abstract] |  |  |  |  |
Accounts receivable, net | [1],[2] |  |  | 212,377 |
Contract liability (Deferred revenue) | [1],[2] |  |  | 486,353 |
Contract liability (Deferred revenue) (included in Other Long-Term Liabilities) | [2] |  |  | 0 |
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member] |  |  |  |  |
Balances from contracts with customers [Abstract] |  |  |  |  |
Accounts receivable, net |  |  |  | 93,349 |
Contract liability (Deferred revenue) |  |  |  | $ 89,364 |
Increase/(decrease) [Abstract] |  |  |  |  |
Accounts receivable, net | [1] | 82,490 |  |  |
Contract liability (Deferred revenue) | [1] | 21,012 |  |  |
Contract liability (Deferred revenue) (included in Other Long-Term Liabilities) |  | $ 10,722 |  |  |
[1] | Due to the adoption of the new revenue standard, the sales return reserve as of April 30, 2019 of $25.9 million is recorded in Contract Liability (Deferred Revenue). In prior periods, it was recorded as a reduction to Accounts Receivable, net on the Consolidated Statements of Financial Position. At April 30, 2018 the sales return reserve was $28.3 million.
[2] | As noted above, prior period amounts have not been adjusted due to adoption of the new revenue standard under the modified retrospective method.

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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