Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Aquila [Member]
Related Party Transaction [Line Items]
Sales to related party	$ 1,870	$ 965	$ 3,673	$ 3,041
Purchases from related party	23	253	31	253
Amounts in accounts receivable	1,905		1,905		3,799
Amounts in accounts payable	147		147		227
Nagase-Landauer, Ltd. [Member]
Related Party Transaction [Line Items]
Sales to related party	109	315	755	720
Purchases from related party	196	319	462	801
Amounts in accounts receivable	35		35		27
Amounts in accounts payable					$ 60

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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