Consolidated Statements Of Income And Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Income Statement [Abstract]
Tax benefits from discontinued operations	$ (5.4)	$ (8.1)	$ (15.4)

Discontinued Operation, Tax Effect of Operations of Discontinued Operation

No definition available.

Name:	hrb_DiscontinuedOperationTaxEffectOfOperationsOfDiscontinuedOperation
Namespace Prefix:	hrb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration