Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2017	Jun. 30, 2017
Income tax receivable
Current income tax receivable		$ 0.7	$ 0.7	$ 0.5
Long-term income tax receivable		0.3	$ 0.3
Tax Reform Act
Federal income tax rate	21.00%		35.00%
Income tax expense due to remeasurement of deferred tax assets and liabilities		1.4
Income tax benefit due to reduction in the valuation allowance previously recognized on AMT credit carryforwards		(0.3)
Other Long-term Liabilities
Income tax receivable
Uncertain tax positions		$ 0.9	$ 0.9	$ 1.0