Description of Business (Liquidity and Capital Resources) (Details) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jan. 02, 2015	Apr. 17, 2015	Sep. 30, 2014	Sep. 30, 2013	May 06, 2015	Dec. 10, 2014	Oct. 22, 2014	Apr. 16, 2015
Auction Market Preferred Securities, Stock Series [Line Items]
Cash and cash equivalents	$ 140,965,000	$ 18,175,000	$ 140,965,000	$ 18,175,000			$ 20,687,000	$ 16,104,000
Working capital	153,800,000		153,800,000
Net income (loss)	3,052,000	(5,432,000)	59,180,000	(7,486,000)
Subsequent Event
Auction Market Preferred Securities, Stock Series [Line Items]
Stock repurchase program, authorized amount									45,000,000
Revolving Credit Facility | Sixth Amendment
Auction Market Preferred Securities, Stock Series [Line Items]
Line of credit facility, maximum borrowing capacity										15,000,000.00
Revolving Credit Facility | LIBOR Rate Loan
Auction Market Preferred Securities, Stock Series [Line Items]
Line of credit facility, maximum borrowing capacity										35,000,000
Digital Products Business
Auction Market Preferred Securities, Stock Series [Line Items]
Asset purchase agreement, selling price											17,500,000
Asset sale, cash consideration					1,500,000
Asset sale, promissory note, principal amount											16,000,000
Proceeds from sale of business			1,500,000	0
Digital Products Business | Subsequent Event
Auction Market Preferred Securities, Stock Series [Line Items]
Asset sale, promissory note, principal amount												15,500,000
Proceeds from sale of business						15,700,000
Photovoltaics | Photovoltaics Business
Auction Market Preferred Securities, Stock Series [Line Items]
Asset purchase agreement, selling price										$ 150,000,000