Receivables (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Oct. 31, 2017	Apr. 30, 2017	Oct. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired non-accrual status term, days	60 days
Term Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	$ 25.3	$ 27.0	$ 31.4
Revolving Lines Of Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables, net	55.1	49.5	64.4
Loans to franchisees
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Recorded Investment, Past Due	2.3	0.1	1.4
Instant Cash Back® receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Short-term	0.0	1.5	0.0
H&R Block Emerald Advance® lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual status loans	$ 27.9	$ 28.0	$ 20.8