Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Oct. 02, 2015
Current:
Inventory	$ 8.1	$ 4.9
Bad debts	0.2	0.1
Accrued compensation and benefits	5.4	5.2
Product returns, allowances and warranty	8.6	4.3
Restructuring	0.8	0.1
Other - net	3.1	0.6
Current deferred tax assets	26.2	15.2
Less valuation allowance	(12.2)	(6.4)
Net current deferred tax assets	14.0	8.8
Long-term:
Intangible assets	11.6	11.6
Share-based and other deferred compensation	40.2	44.6
Net operating loss carry forwards	7.4	7.4
Federal tax credits	14.7	11.5
State tax credits	64.0	53.4
Other - net	2.5	2.4
Long-term deferred tax assets	140.4	130.9
Less valuation allowance	(66.9)	(58.8)
Net long-term deferred tax assets	73.5	72.1
Deferred tax assets	166.6	146.1
Less valuation allowance	(79.1)	(65.2)
Net deferred tax assets	87.5	80.9
Deferred Tax Liabilities:
Prepaid insurance	(0.8)	(0.8)
Current deferred tax liabilities	(0.8)	(0.8)
Property, plant and equipment	(16.5)	(10.1)
Intangible assets	(8.4)	(8.2)
Long-term deferred tax liabilities	(24.9)	(18.3)
Net deferred tax liabilities	(25.7)	(19.1)
Total deferred tax assets	$ 61.8	$ 61.8