Debt (Notes)	3 Months Ended
Sep. 30, 2015
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	DEBT Revolving Credit Facility The Company has a revolving credit facility with a group of banks expiring in May 2017. This agreement provides for unsecured borrowings of up to $150,000. Fees on this facility range from 0.09% to 0.175% per year based upon the Company's leverage ratio at each quarter end. Borrowings under this agreement carry variable interest rates tied to either LIBOR, prime, or the bank’s cost of funds at the Company’s discretion. This agreement also enables the Company to refinance this debt on a long-term basis. At September 30, 2015 and June 30, 2015, the Company had $87,000 and $52,000, respectively, outstanding under this credit facility. Unused lines under this facility, net of outstanding letters of credit of $3,764 and $3,764 to secure certain insurance obligations, totaled $59,236 and $94,236 at September 30, 2015 and June 30, 2015, respectively and are available to fund future acquisitions or other capital and operating requirements. The weighted-average interest rate on the revolving credit facility outstanding as of September 30, 2015 was 1.13% and June 30, 2015 was 1.15%. Additionally, the Company had letters of credit outstanding with a separate bank, not associated with the revolving credit agreement, in the amount of $1,465 as of September 30, 2015 and $1,841 as of June 30, 2015, in order to secure certain insurance obligations. Long-Term Borrowings The Company entered into a $100,000 unsecured five-year term loan with a group of banks in April 2014, with a final maturity date in April 2019. Borrowings under this agreement carry a variable interest rate tied to LIBOR, which at September 30, 2015 was a rate of 1.25% and at June 30, 2015 was a rate of 1.19%. The term loan had $96,250 and $96,875 outstanding at September 30, 2015 and June 30, 2015, respectively. In April 2014 the Company assumed $2,359 of debt as a part of the headquarters facility acquisition. The 1.5% fixed interest rate note is held by the State of Ohio Development Services Agency, maturing in May 2024. At September 30, 2015 and June 30, 2015, $2,065 and $2,120 was outstanding, respectively. At September 30, 2015 and June 30, 2015, the Company had borrowings outstanding under its unsecured shelf facility agreement with Prudential Investment Management of $170,000. The "Series C" notes have a principal amount of $120,000 and carry a fixed interest rate of 3.19%; the principal is due in equal principal payments in July 2020, 2021 and 2022. The "Series D" notes have a principal amount of $50,000 and carry a fixed interest rate of 3.21%; the principal is due in equal principal payments in October 2019 and 2023. As of September 30, 2015, $50,000 in additional financing was available under this facility.

DEBT

Revolving Credit Facility

The Company has a revolving credit facility with a group of banks expiring in May 2017. This agreement provides for unsecured borrowings of up to $150,000. Fees on this facility range from 0.09% to 0.175% per year based upon the Company's leverage ratio at each quarter end. Borrowings under this agreement carry variable interest rates tied to either LIBOR, prime, or the bank’s cost of funds at the Company’s discretion. This agreement also enables the Company to refinance this debt on a long-term basis. At September 30, 2015 and June 30, 2015, the Company had $87,000 and $52,000, respectively, outstanding under this credit facility. Unused lines under this facility, net of outstanding letters of credit of $3,764 and $3,764 to secure certain insurance obligations, totaled $59,236 and $94,236 at September 30, 2015 and June 30, 2015, respectively and are available to fund future acquisitions or other capital and operating requirements. The weighted-average interest rate on the revolving credit facility outstanding as of September 30, 2015 was 1.13% and June 30, 2015 was 1.15%.

Additionally, the Company had letters of credit outstanding with a separate bank, not associated with the revolving credit agreement, in the amount of $1,465 as of September 30, 2015 and $1,841 as of June 30, 2015, in order to secure certain insurance obligations.

Long-Term Borrowings

The Company entered into a $100,000 unsecured five-year term loan with a group of banks in April 2014, with a final maturity date in April 2019. Borrowings under this agreement carry a variable interest rate tied to LIBOR, which at September 30, 2015 was a rate of 1.25% and at June 30, 2015 was a rate of 1.19%. The term loan had $96,250 and $96,875 outstanding at September 30, 2015 and June 30, 2015, respectively.

In April 2014 the Company assumed $2,359 of debt as a part of the headquarters facility acquisition. The 1.5% fixed interest rate note is held by the State of Ohio Development Services Agency, maturing in May 2024. At September 30, 2015 and June 30, 2015, $2,065 and $2,120 was outstanding, respectively.

At September 30, 2015 and June 30, 2015, the Company had borrowings outstanding under its unsecured shelf facility agreement with Prudential Investment Management of $170,000. The "Series C" notes have a principal amount of $120,000 and carry a fixed interest rate of 3.19%; the principal is due in equal principal payments in July 2020, 2021 and 2022. The "Series D" notes have a principal amount of $50,000 and carry a fixed interest rate of 3.21%; the principal is due in equal principal payments in October 2019 and 2023. As of September 30, 2015, $50,000 in additional financing was available under this facility.