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Receivables (Schedule Of Aging Of Notes Receivable) (Details) (USD $) In Millions	Sep. 30, 2011
Receivables [Abstract]
Over 30 days to 60 days	$ 1.7
Over 60 days	$ 0.4

X

- Definition

Notes Receivable, Aged over 30 Days,

+ Details

Name:	adp_NotesReceivableAgedOver30Days
Namespace Prefix:	adp
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Notes Receivable, Aged over 60 Days, Non-Accrual

+ Details

Name:	adp_NotesReceivableAgedOver60DaysNonAccrual
Namespace Prefix:	adp
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration