Description of Business - Planned Asset Sales (Details) (USD $)	12 Months Ended	0 Months Ended
	Sep. 30, 2014 segment	Dec. 10, 2014 Subsequent Event segment	Dec. 05, 2014 Subsequent Event segment	Oct. 22, 2014 Subsequent Event Digital Products Business	Oct. 22, 2014 Subsequent Event Digital Products Business	Dec. 10, 2014 Photovoltaics Subsequent Event Photovoltaics Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations Line Items
Number of reporting segments	2	1	1
Planned aggregate purchase price					$ 17,500,000.0	$ 150,000,000.0
Planned aggregate purchase price, cash				1,500,000.0
Promissory note receivable for planned transaction					$ 16,000,000.0
Interest rate on promissory note, year one					0.05
Interest rate on promissory note, year two					0.13