Debt (Notes)	9 Months Ended
Mar. 31, 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 March 31, 2015 and June 30, 2014, the Company had $120,000 and $69,000 outstanding under this credit facility, respectively. Unused lines under this facility, net of outstanding letters of credit of $6,800 and $8,700 to secure certain insurance obligations, totaled $23,000 and $72,300 at March 31, 2015 and June 30, 2014, 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 March 31, 2015 was 1.06% and June 30, 2014 was 0.85%. 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 March 31, 2015 was 1.19% and at June 30, 2014 was 1.06%. The term loan had $97,500 and $99,400 outstanding at March 31, 2015 and June 30, 2014, respectively. In April 2014, the Company assumed $2,400 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 March 31, 2015 and June 30, 2014, $2,200 and $2,300 was outstanding, respectively. At March 31, 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%, which is due in equal principal payments in July 2020, 2021 and 2022. The "Series D" notes have a principle amount of $50,000 and carry a fixed interest rate of 3.21% which is due in equal principal payments in October 2019 and 2023. As of March 31, 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 March 31, 2015 and June 30, 2014, the Company had $120,000 and $69,000 outstanding under this credit facility, respectively. Unused lines under this facility, net of outstanding letters of credit of $6,800 and $8,700 to secure certain insurance obligations, totaled $23,000 and $72,300 at March 31, 2015 and June 30, 2014, 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 March 31, 2015 was 1.06% and June 30, 2014 was 0.85%.

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 March 31, 2015 was 1.19% and at June 30, 2014 was 1.06%. The term loan had $97,500 and $99,400 outstanding at March 31, 2015 and June 30, 2014, respectively.

In April 2014, the Company assumed $2,400 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 March 31, 2015 and June 30, 2014, $2,200 and $2,300 was outstanding, respectively.

At March 31, 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%, which is due in equal principal payments in July 2020, 2021 and 2022. The "Series D" notes have a principle amount of $50,000 and carry a fixed interest rate of 3.21% which is due in equal principal payments in October 2019 and 2023. As of March 31, 2015, $50,000 in additional financing was available under this facility.