Significant Accounting Policies - Schedule of Changes in AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Sep. 30, 2013
Schedule of Accumulated Other Comprehensive Income
Accumulated other comprehensive loss	$ (7,744)	$ (23,072)		$ (7,744)	$ (23,072)	$ (8,231)	$ (8,720)
Reclassification of benefit plan actuarial losses and prior service cost	95			193
Reclassifications of net losses on interest rate protection agreements	392	118		783	237
Quantifying Misstatement in Current Year Financial Statements, Amount			20,709
Derivative
Schedule of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(2,654)			(2,654)		(3,046)	(3,437)
Reclassification of benefit plan actuarial losses and prior service cost	0			0
Reclassifications of net losses on interest rate protection agreements	392			783
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member]
Schedule of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(5,090)			(5,090)		(5,185)	(5,283)
Reclassification of benefit plan actuarial losses and prior service cost	(95)			(193)
Reclassifications of net losses on interest rate protection agreements	$ 0			$ 0