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Recent Accounting Standards, Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Apr. 30, 2018	Apr. 30, 2017
Recently Adopted Accounting Standards [Abstract]
Net charges (benefits)		$ (1,904)	$ (1,762)	$ (5,823)	$ (5,144)
Reconciliation of cash, cash equivalents and restricted cash reported within Condensed Consolidated Statement of Cash Flows [Abstract]
Cash and cash equivalents		132,758	128,217	132,758	128,217	$ 169,773	$ 58,516
Restricted cash included in Prepaid expenses and other current assets		632	545	632	545	484	0
Total cash, cash equivalents, and restricted cash shown in the Unaudited Condensed Consolidated Statement of Cash Flows	[1]	133,390	128,762	133,390	128,762	$ 170,257	$ 58,516
ASU 2017-07 Member] | Operating and Administrative Expenses [Member]
Recently Adopted Accounting Standards [Abstract]
Net charges (benefits)			2,000		6,000
ASU 2017-07 Member] | Interest and Other Income [Member]
Recently Adopted Accounting Standards [Abstract]
Net charges (benefits)		$ 2,100	$ (2,000)	$ 6,600	(6,000)
ASU 2016-18 [Member]
Recently Adopted Accounting Standards [Abstract]
Reduction in cash used in operating activities					$ (500)
[1] Due to the retrospective adoption of ASU 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash," we are now required to include restricted cash as part of the change in cash, cash equivalents, and restricted cash. As a result, amounts which were previously classified as cash flows from operating activities have been reclassified as they are recognized in the total change in cash, cash equivalents and restricted cash. Refer to Note 2, "Recent Accounting Standards," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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