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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Aquila [Member]
Related Party Transaction [Line Items]
Sales to related party	$ 681	$ 1,191	$ 681	$ 2,758
Purchases from related party	253	0	253	27
Nagase-Landauer, Ltd. [Member]
Related Party Transaction [Line Items]
Sales to related party	284	67	621	236
Purchases from related party	$ 319	$ 881	$ 801	$ 1,738
Equity interest	50.00%		50.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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