Financial Data By Segment And Geographic Area (Narrative) (Details)	12 Months Ended
Jun. 30, 2011
Financial Data By Segment And Geographic Area
Standard reconciling rate between actual interest income earned and interest credited	4.50%

Name:

adp_StandardReconcilingRateBetweenActualInterestIncomeEarnedAndInterestCredited

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adp

Data Type:

num:percentItemType

Balance Type:

na

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duration