Short-Term Financing	12 Months Ended
Jun. 30, 2017
Short-Term Financing [Abstract]
Short-Term Financing	NOTE 9. SHORT TERM FINANCING The Company has a $3.50 billion, 364-day credit agreement that matures June 2018 with a one year term-out option. The Company also has a $2.25 billion five-year credit facility that matures in June 2022 that also contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. In addition, the Company has a five-year $3.75 billion credit facility maturing in June 2021 that contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to LIBOR, the effective federal funds rate, or the prime rate depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through June 30, 2017 and 2016 under the credit agreements. Our U.S. short-term funding requirements related to client funds are sometimes obtained on an unsecured basis through the issuance of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. During the majority of fiscal 2017, this commercial paper program provided for the issuance of up to $9.25 billion in aggregate maturity value; in June 2017, the Company increased its U.S. short-term commercial paper program to provide for the issuance of up to $9.5 billion in aggregate maturity value. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s and Prime-1 by Moody’s. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days. At June 30, 2017 and 2016, the Company had no commercial paper outstanding. In fiscal 2017 and 2016, the Company's average daily borrowings were $3.1 billion and $2.7 billion, respectively, at a weighted average interest rate of 0.6% and 0.3%, respectively. The weighted average maturity of the Company’s commercial paper in fiscal 2017 and 2016 was approximately two days. The Company’s U.S. and Canadian short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five business days. At June 30, 2017 and 2016, there were no outstanding obligations related to the reverse repurchase agreements. In fiscal 2017 and 2016, the Company had average outstanding balances under reverse repurchase agreements of $274.8 million and $341.0 million, respectively, at weighted average interest rates of 0.6% and 0.4%, respectively.

NOTE 9. SHORT TERM FINANCING

The Company has a $3.50 billion, 364-day credit agreement that matures June 2018 with a one year term-out option. The Company also has a $2.25 billion five-year credit facility that matures in June 2022 that also contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. In addition, the Company has a five-year $3.75 billion credit facility maturing in June 2021 that contains an accordion feature under which the aggregate commitment can be increased by $500 million, subject to the availability of additional commitments. The interest rate applicable to committed borrowings is tied to LIBOR, the effective federal funds rate, or the prime rate depending on the notification provided by the Company to the syndicated financial institutions prior to borrowing. The Company is also required to pay facility fees on the credit agreements. The primary uses of the credit facilities are to provide liquidity to the commercial paper program and funding for general corporate purposes, if necessary. The Company had no borrowings through June 30, 2017 and 2016 under the credit agreements.

Our U.S. short-term funding requirements related to client funds are sometimes obtained on an unsecured basis through the issuance of commercial paper, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. During the majority of fiscal 2017, this commercial paper program provided for the issuance of up to $9.25 billion in aggregate maturity value; in June 2017, the Company increased its U.S. short-term commercial paper program to provide for the issuance of up to $9.5 billion in aggregate maturity value. The Company’s commercial paper program is rated A-1+ by Standard & Poor’s and Prime-1 by Moody’s. These ratings denote the highest quality commercial paper securities. Maturities of commercial paper can range from overnight to up to 364 days. At June 30, 2017 and 2016, the Company had no commercial paper outstanding. In fiscal 2017 and 2016, the Company's average daily borrowings were $3.1 billion and $2.7 billion, respectively, at a weighted average interest rate of 0.6% and 0.3%, respectively. The weighted average maturity of the Company’s commercial paper in fiscal 2017 and 2016 was approximately two days.

The Company’s U.S. and Canadian short-term funding requirements related to client funds obligations are sometimes obtained on a secured basis through the use of reverse repurchase agreements, which are collateralized principally by government and government agency securities, rather than liquidating previously-collected client funds that have already been invested in available-for-sale securities. These agreements generally have terms ranging from overnight to up to five business days. At June 30, 2017 and 2016, there were no outstanding obligations related to the reverse repurchase agreements. In fiscal 2017 and 2016, the Company had average outstanding balances under reverse repurchase agreements of $274.8 million and $341.0 million, respectively, at weighted average interest rates of 0.6% and 0.4%, respectively.