Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Peace of Mind® Extended Service Plan
Disaggregation of Revenue [Line Items]
Current deferred revenue	$ 101,900
Peace of Mind® Extended Service Plan \| Deferred Revenue
Disaggregation of Revenue [Line Items]
Deferred revenue	183,871	$ 183,685	$ 212,511
Revenues from Tax Identity Shield®
Disaggregation of Revenue [Line Items]
Current deferred revenue	$ 28,900	$ 30,800