Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2018	Sep. 30, 2018	Jun. 30, 2018
Income tax receivable
Current income tax receivable		$ 0.5	$ 0.5
Long-term income tax receivable		$ 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		$ 1.0	$ 1.0