Receivables (Narrative) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired non-accrual status term, days	60 days
Maximum EA line of credit	$ 1,000
Loans to franchisees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of loans past due	$ 800,000	$ 100,000
Past due term	90 days