Note 7 - Debt (Details Textual) $ in Millions	12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Amended and Restated Credit Agreement [Member]
Debt Instrument, Term		5 years
Line of Credit Facility, Maximum Borrowing Capacity		$ 400.0
Line Of Credit, Accordion Feature		100.0
Swing Line Loan [Member]
Line of Credit Facility, Maximum Borrowing Capacity		10.0
Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		30.0
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		225.0
Standby Letters of Credit [Member]
Long-term Line of Credit	$ 7.7	$ 7.2
Minimum [Member]
Interest Coverage Ratio, Requirement	3
Maximum [Member]
Leverage Ratio, Requirement	3.5
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 50.0
Derivative, Average Fixed Interest Rate	1.43%
Line of Credit Facility, Expiration Date		January 2017
Line of Credit Facility, Remaining Borrowing Capacity	$ 254.4
Extraordinary and Certain Other Defined Items Excluded from Adjusted EBIT	$ 7.5
Interest Coverage Ratio, Actual	28.76
Leverage Ratio, Actual	1.01
Long-term Line of Credit	$ 93.0
Line of Credit Facility, Interest Rate at Period End	1.76%