2.4.0.8010001 - Disclosure - Generaltruefalsefalse1false falsefalseFROM_Apr01_2013_TO_Jun30_2013http://www.sec.gov/CIK0001323974duration2013-04-01T00:00:002013-06-30T00:00:001true 1mwiv_GeneralAbstractmwiv_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0General [Abstract]2false 2us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00Basis of PresentationThe accompanying unaudited condensed consolidated financial statements include the results of operations, financial position and cash flows of MWI Veterinary Supply, Inc. and its wholly-owned subsidiaries (collectively referred to as “we,” “us,” and “our” throughout this Form 10-Q). All intercompany balances have been eliminated. In the opinion of our management, the accompanying unaudited condensed consolidated financial statements include all adjustments necessary to present fairly, in all material respects, our results for the periods presented. These condensed consolidated financial statements have been prepared by us pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted pursuant to such rules and regulations. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in our 2012 Annual Report on Form 10-K filed with the SEC on November 27, 2012. The results of operations for the three and nine months ended June 30, 2013 are not necessarily indicative of results to be expected for the entire fiscal year.Our unaudited condensed consolidated balance sheet as of September 30, 2012 has been derived from the audited consolidated balance sheet as of that date. Use of EstimatesThe accompanying unaudited condensed consolidated financial statements have been prepared on the accrual basis of accounting using accounting principles generally accepted in the United States. In preparing financial information, we use certain estimates and assumptions that may affect the reported amounts and disclosures. Some of these estimates require difficult, subjective and complex judgments about matters that are inherently uncertain. As a result, actual results could differ materially from these estimates. Estimates are used when accounting for, among other items, sales returns, allowance for doubtful accounts, customer incentives, vendor rebates, inventories, goodwill and intangible assets, income taxes, impairment of long-lived assets, depreciation and amortization, employee benefits, unearned income and contingencies. The estimates of fair value of assets and liabilities and the disclosure of contingent assets and liabilities as of the balance sheet date and reported amounts of revenue and expenses for the periods are based on assumptions that we believe to be reasonable.Revenue RecognitionWe sell products we source from vendors to our customers through either a “buy/sell” transaction or an agency relationship with our vendors. In a “buy/sell” transaction, we purchase or take inventory of products from the vendor. When a customer places an order with us, we pick, pack, ship and invoice the customer for the order. We recognize revenue from “buy/sell” transactions as product sales when the product is delivered to the customer. We accept product returns from our customers. We estimate returns based on historical experience and recognize these estimated returns as a reduction of product sales. Product returns have historically not been significant to our financial statements. We record revenues net of sales tax. In an agency relationship, we generally do not purchase and take inventory of products from vendors. We receive an order from a customer, then transmit the order to the vendor, who picks, packs and ships the order to the customer. In some cases, the vendor invoices and collects payment from the customer, while in other cases we invoice and collect payment from the customer on behalf of the vendor. We receive a commission payment for soliciting the order from the customer and for providing other customer service activities. Commissions are recognized when the services upon which the commissions are based are complete. Gross billings from agency contracts were $97,337 and $90,873 for the three months ended June 30, 2013 and 2012, respectively, and generated commission revenue of $4,772 and $4,555, respectively. Gross billings from agency contracts were $258,647 and $246,866 for the nine months ended June 30, 2013 and 2012, respectively, and generated commission revenue of $14,237 and $12,699, respectively. Customer incentives are accrued based on the terms of the contracts with each customer. These incentive programs provide that the customer receive an incentive based on their product purchases or attainment of performance goals. Incentives are estimated based on the specific terms in each agreement, historical experience and product growth rates. Incentives are recognized as a reduction to product sales.Cost of Product Sales and Vendor RebatesCost of product sales consist of our inventory product cost, including shipping and delivery costs to and from our distribution centers. Vendor rebates are recorded based on the terms of the contracts or programs with each vendor. Many of our vendors' rebate programs are based on a calendar year. We may receive quarterly, semi-annual or annual performance-based rebates from third-party vendors based upon attainment of certain sales and/or purchase goals. Sales rebates are classified in the accompanying condensed consolidated statements of income as a reduction to cost of product sales at the time the sales performance measures are achieved. Purchase rebates are measured against inventory purchases from the vendors and are classified as a reduction of inventory until the product is sold. When the inventory is sold and purchase measures are achieved, purchase rebates are recognized as a reduction to cost of product sales. Historically, actual results have not significantly deviated from those determined using the estimates described above. We expect that our estimates in the future will continue to be reasonable as our rebates are based on specific vendor program goals and are principally recorded upon achievement of sales or purchase performance measures. Vendors may change or eliminate rebate programs from year to year.Concentrations of RiskOur financial instruments that are exposed to concentrations of credit risk consist primarily of our receivables. Our customers are geographically dispersed throughout the United States and United Kingdom. In the United Kingdom, we rely on a smaller number of relatively larger customers than does our business in the United States. We routinely assess the financial strength of our customers and review their credit history before extending credit. In addition, we establish an allowance for doubtful accounts based upon factors surrounding the credit risk of specific customers, historical trends and other information.  falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 4, 14, 15 -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. 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