Related Party (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 260	$ 233	$ 557	$ 497
Product sales to related party	16,799	14,585	35,805	30,143
Due from (to) Related Party	$ (1,490)		$ (1,490)		$ 62
Feeders Advantage [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment Ownership Percentage	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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Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date within one year where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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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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