Description of Business (Sale of Photovoltaics and Digital Products Businesses) (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 22, 2014	Sep. 30, 2015	Apr. 17, 2015	Apr. 16, 2015	Jan. 02, 2015	Dec. 10, 2014	Sep. 17, 2014
Photovoltaics Business [Member] | Photovoltaics [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price						$ 150.0	$ 150.0
Working capital adjustment		$ 0.1
Digital Products Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset purchase agreement, selling price	$ 17.5
Asset sale, cash consideration	1.5
Asset sale, promissory note, principal amount	$ 16.0			$ 15.5	$ 1.5
Accrued interest on note receivable			$ 0.2