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Trade Receivables (Details) (USD $)	6 Months Ended
Trade Receivables (Details) (USD $)	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables, less allowances related to Iranian custome	$ 285,151,000	$ 307,745,000	$ 320,504,000
Iranian customers [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables, less allowances related to Iranian custome	20,000,000	19,000,000	17,000,000
Trade receivables reserved amounts related to Iranian customer	$ 9,000,000

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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