Statements Of Consolidated Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Income Statement [Abstract]
Direct pass-through costs, Professional Employer Organization revenues	$ 19,956.2	$ 17,792.2	$ 15,765.3

Direct pass-through costs associated with PEO, primarily consisting of payroll wages and payroll taxes.

No definition available.

Name:	adp_DirectPassThroughCostsPEORevenues
Namespace Prefix:	adp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration