2.4.0.8010012 - Disclosure - Related Partiestruefalsefalse1false falsefalseFROM_Apr01_2013_TO_Jun30_2013http://www.sec.gov/CIK0001323974duration2013-04-01T00:00:002013-06-30T00:00:001true 1us-gaap_RelatedPartyTransactionsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Related Party Transactions [Abstract]2false 2us-gaap_RelatedPartyTransactionsDisclosureTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00MWI Co. holds a 50.0% membership interest in Feeders' Advantage LLC (“Feeders' Advantage”). MWI Co. charged Feeders' Advantage for certain operating and administrative services in the amounts of $240 and $237 for the three months ended June 30, 2013 and 2012, respectively and $797 and $733 for the nine months ended June 30, 2013 and 2012, respectively. Sales of products to Feeders' Advantage were $15,229 and $14,351, which represented 3% of total product sales for each of the three months ended June 30, 2013 and 2012. Sales of products to Feeders' Advantage were $51,034 and $44,494, which represented 3% of total product sales for each of the nine months ended June 30, 2013 and 2012. MWI Co. allows Feeders' Advantage to use its cash management system to finance its day-to-day operations. At any given time, the outstanding position used in the cash management system may be a receivable or payable depending on the cash activity. A receivable balance bears interest at the prime rate. The interest due on the outstanding receivable is calculated and charged to Feeders' Advantage on the last day of each month. Conversely, to the extent MWI Co. has a payable balance due to Feeders' Advantage, the payable balance accrues interest in favor of Feeders' Advantage at the average federal funds rates in effect for that month. MWI Co. had a payable balance to Feeders' Advantage of $1,508 as of June 30, 2013 and a receivable balance from Feeders' Advantage of $62 as of September 30, 2012.falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 3A Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Article 4 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 1-4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Related Party Transactions Disclosure [Text Block]falseRelated PartiesUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.mwivet.com/role/RelatedParties12