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Post Retirement Benefits (Details) (USD $)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Sep. 30, 2012
Pension, health and life insurance expense:        
Multi-employer plan contributions $ 171,000 $ 110,000 $ 336,000 $ 215,000
Defined contribution plan contributions 148,000 116,000 361,000 285,000
Total pension expense 319,000 226,000 697,000 500,000
Interest cost 69,000 83,000 138,000 166,000
Amortization of prior service costs (124,000) (124,000) (248,000) (248,000)
Amortization of net loss 12,000 51,000 24,000 101,000
Net periodic benefit cost (43,000) 10,000 (86,000) 19,000
Total post retirement benefits expense 276,000 236,000 611,000 519,000
Payments to pension plans     788,000  
Payments for post retirement healthcare and life insurance     352,000  
Expected payments to pension plans     435,000  
Expected future payments for other post retirement benefits     $ 591,000