Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Aquila [Member]      
Related Party Transaction [Line Items]      
Sales to related party $ 1,743 $ 2,076  
Purchases from related party 8    
Amounts in accounts receivable 1,812   3,799
Amounts in accounts payable     227
Nagase-Landauer, Ltd. [Member]      
Related Party Transaction [Line Items]      
Sales to related party 30 169  
Purchases from related party 266 857  
Amounts in accounts receivable 11   27
Amounts in accounts payable $ 41   $ 60