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Long-Term Debt (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2011
Bank
Long Term Debt (Textual) [Abstract]  
Number of banks involved in line of credit facility 5
Revolving credit facility $ 175
Line of credit potential maximum 225
Term loan outstanding 17.5
Interest rate description of credit agreement, minimum interest rate of LIBOR plus 250 basis points or the bank’s base rate plus 150 basis points
Interest rate description LIBOR plus 200 to 275 basis points or the bank’s base rate plus 100 to 175 basis points
Commitment fee description commitment fee of 37.5 to 50 basis points depending on our leverage ratio calculated at the end of each quarter
Outstanding amount under revolving credit agreement 40.5
Bank letters of credit 5.0
Revolving credit facility $ 129.5
Maturity period of new credit agreement 4 years
Credit agreement initiation date 05-10-2011
Credit agreement expiration date 05-10-2015
Interbank offered rate LIBOR
Minimum interest rate of LIBOR on unused amount of credit facility 2.50%
Minimum bank base rate on unused amount of credit facility 1.50%
Commitment fee on unused amount of credit facility 0.50%
Maximum [Member]
  
Debt Instrument [Line Items]  
Interest rate to the lenders 2.75%
Bank base rate 1.75%
Commitment fee 0.50%
Minimum [Member]
  
Debt Instrument [Line Items]  
Interest rate to the lenders 2.00%
Bank base rate 1.00%
Commitment fee 0.375%