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Credit Facilities (Details) (USD $)
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Revolving Credit Facility
LIBOR Rate Loan
letter_of_credit
Nov. 11, 2010
Revolving Credit Facility
LIBOR Rate Loan
Dec. 10, 2014
Subsequent Event
Revolving Credit Facility
LIBOR Rate Loan
Dec. 09, 2014
Subsequent Event
Revolving Credit Facility
LIBOR Rate Loan
Dec. 10, 2014
Photovoltaics Business
Photovoltaics
Subsequent Event
Line of Credit Facility [Line Items]              
Planned aggregate purchase price             $ 150,000,000.0
Line of credit facility, maximum borrowing capacity       15,000,000.00 15,000,000.0 35,000,000  
Borrowings from credit facility 26,518,000 21,706,000 26,500,000        
Credit facility, interest rate on outstanding balance     3.30%        
Standby letters of credit, total amount outstanding     $ 1,900,000        
Number of standby letters of credit outstanding     6        
Credit facility, expected availability amount over next twelve month period, as percentage of maximum revolving credit amount (at least 50%)     50.00%