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Pension Plans And Other Post Retirement Benefits (Components Of Net Pension Expense For CDT Pension Plan) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 113   $ 326
Interest cost 220   873
Net pension expense 242 137  
CDT Pension Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 113 85  
Interest cost 220 227  
Amortization of actuarial gains and losses 68 0  
Net pension expense $ 401 $ 312