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Subsequent Events Subsequent Events	12 Months Ended
Subsequent Events Subsequent Events	Jun. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	NOTE 17. SUBSEQUENT EVENTS The Company's subsidiary captive insurance company, ADP Indemnity, paid a premium of $235.0 million in July 2017 to enter into a reinsurance arrangement with Chubb to cover substantially all losses for the fiscal 2018 policy year on terms substantially similar to the fiscal 2017 reinsurance policy to cover losses up to $1 million per occurrence related to the workers' compensation and employer's liability deductible reimbursement insurance protection for PEO Services worksite employees.