Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Revenues from Peace of Mind® Extended Service Plan
Disaggregation of Revenue [Line Items]
Current deferred revenue	$ 119,200
Expected recognition period	60 months
Revenues from Peace of Mind® Extended Service Plan | Deferred Revenue
Disaggregation of Revenue [Line Items]
Description of timing	Revenues from Peace of Mind® Extended Service Plan (POM) are initially deferred and recognized over the term of the plan, based on the historical pattern of actual claims paid, as claims paid represent the transfer of POM services to the customer. The plan is effective for the life of the tax return, which can be up to six years; however, the majority of claims are incurred in years two and three after the sale of POM.
Deferred revenue	$ 212,511	$ 218,274	$ 211,223
Revenues from Tax Identity Shield®
Disaggregation of Revenue [Line Items]
Current deferred revenue	$ 29,700	$ 36,400