MWI Veterinary Supply (MWIV) 10-K 26 Nov 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Nov. 14, 2014	Mar. 31, 2014
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Document Period End Date	30-Sep-14	'	'
AmendmentFlag	'false	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year Focus	'2014	'	'
Current Fiscal Year End Date	'--09-30	'	'
Entity Central Index Key	'0001323974	'	'
Trading Symbol	'mwiv	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Registrant Name	'MWI Veterinary Supply, Inc.	'	'
Entity Voluntary Filers	'No	'	'
Entity Well Known Seasoned Issuer	'Yes	'	'
Entity Common Stock Shares Outstanding	'	12,912,068	'
Entity Public Float	'	'	$1,932

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenues:	'	'	'
Product sales	$2,892,023	$2,260,279	$1,996,294
Product sales to related party	68,501	68,355	61,873
Commissions	20,514	18,851	16,979
Total revenues	2,981,038	2,347,485	2,075,146
Cost of product sales	2,609,725	2,043,147	1,808,230
Gross profit	371,313	304,338	266,916
Selling, general and administrative expenses	241,717	193,999	172,104
Depreciation and amortization	11,836	10,016	9,045
Operating income	117,760	100,323	85,767
Other income (expense):	'	'	'
Interest expense	-1,186	-714	-926
Earnings of equity method investees	342	337	318
Other	789	735	781
Total other (expense) income, net	-55	358	173
Income before taxes	117,705	100,681	85,940
Income tax expense	-45,743	-37,832	-32,463
Net income	$71,962	$62,849	$53,477
Earnings Per Share, Basic and Diluted [Abstract]	'	'	'
Basic	$5.66	$4.96	$4.24
Diluted	$5.65	$4.95	$4.23
Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract]	'	'	'
Weighted Average Number of Shares Outstanding, Basic	12,715	12,675	12,616
Weighted Average Number of Shares Outstanding, Diluted	12,745	12,709	12,647

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'
Net income	$71,962	$62,849	$53,477
Other comprehensive income (loss)	'	'	'
Foreign currency translation	-293	237	1,877
Actuarial (loss) gain on unfunded pension liability, net of tax of $(207), $48, and $145, respectively	-318	139	228
Total comprehensive income	$71,351	$63,225	$55,582

CONSOLIDATED_STATEMENTS_OF_COM1

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]	'	'	'
Actuarial gain on unfunded pension liability, tax (benefit) provision	($207)	$48	$145

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$2,433	$953
Receivables, net	398,990	307,445
Inventories	430,499	326,093
Prepaid expenses and other current assets	8,436	6,004
Deferred income taxes	2,812	2,327
Total current assets	843,170	642,822
Property and equipment, net	50,150	39,183
Goodwill	86,881	71,150
Intangibles, net	50,093	40,490
Other assets, net	11,622	8,910
Total assets	1,041,916	802,555
Current Liabilities:	'	'
Credit facilities	78,200	18,801
Accounts payable	417,388	324,057
Accrued expenses and other current liabilities	28,792	21,816
Current portion of capital lease obligations	1	103
Total current liabilities	524,381	364,777
Deferred income taxes	12,602	9,321
Long-term portion of capital lease obligations	'	16
Other long-term liabilities	2,562	2,122
Commitments and contingencies	'	'
Stockholders Equity	'	'
Common stock $0.01 par value, 40,000 authorized; 12,912 and 12,848 shares issued and outstanding, respectively	129	128
Additional paid in capital	153,159	148,459
Retained earnings	347,776	275,814
Accumulated other comprehensive income	1,307	1,918
Total stockholders’ equity	502,371	426,319
Total liabilities and stockholders’ equity	$1,041,916	$802,555

Statement_of_Financial_Positio

Statement of Financial Position (Parentheticals) (USD $)	Sep. 30, 2014	Sep. 30, 2013
Statement Of Financial Position [Abstract]	'	'
Common Stock Par Value	$0.01	$0.01
Common Stock shares authorized	40,000,000	40,000,000
Common Stock, Shares Issued	12,912,000	12,848,000
Common Stock Shares Outstanding	12,912,000	12,848,000

STATEMENT_OF_STOCKHOLDERS_EQUI

STATEMENT OF STOCKHOLDERS' EQUITY (USD $)	Common Stock Member	Additional Paid In Capital Member	Accumulated Other Comprehensive Income (Loss) Member	Retained Earnings Member	Total
In Thousands
Balance at Sep. 30, 2011	$126	$133,759	($563)	$159,488	$292,810
Balance (shares) at Sep. 30, 2011	12,618	'	'	'	'
Net income	'	'	'	53,477	53,477
Issuance of common stock	'	562	'	'	562
Issuance of common stock (shares)	7	'	'	'	'
Issuance of common stock for purchase of Micro	1	7,158	'	'	7,159
Issuance of common stock for purchase of Micro (shares)	94	'	'	'	'
Exercises of common stock options	'	154	'	'	154
Exercises of common stock options (shares)	15	'	'	'	'
Tax benefit of common stock exercises	'	895	'	'	895
Issuance of stock awards, net of forfeitures	1	2,139	'	'	2,140
Issuance of stock awards, net of forfeitures (shares)	58	'	'	'	'
Foreign currency translation	'	'	1,877	'	1,877
Actuarial (loss) gain on unfunded pension liability, net of tax of $(207), $48, and $145, respectively	'	'	228	'	228
Balance at Sep. 30, 2012	128	144,667	1,542	212,965	359,302
Shares Balance at Sep. 30, 2012	12,792	'	'	'	'
Net income	'	'	'	62,849	62,849
Issuance of common stock	'	651	'	'	651
Issuance of common stock (shares)	5	'	'	'	'
Exercises of common stock options	'	108	'	'	108
Exercises of common stock options (shares)	6	'	'	'	'
Tax benefit of common stock exercises	'	1,323	'	'	1,323
Issuance of stock awards, net of forfeitures	'	1,710	'	'	1,710
Issuance of stock awards, net of forfeitures (shares)	45	'	'	'	'
Foreign currency translation	'	'	237	'	237
Actuarial (loss) gain on unfunded pension liability, net of tax of $(207), $48, and $145, respectively	'	'	139	'	139
Balance at Sep. 30, 2013	128	148,459	1,918	275,814	426,319
Shares Balance at Sep. 30, 2013	12,848	'	'	'	12,848
Net income	'	'	'	71,962	71,962
Issuance of common stock	'	841	'	'	841
Issuance of common stock (shares)	6	'	'	'	'
Exercises of common stock options	'	72	'	'	72
Exercises of common stock options (shares)	4	'	'	'	'
Tax benefit of common stock exercises	'	963	'	'	963
Issuance of stock awards, net of forfeitures	1	2,912	'	'	2,913
Issuance of stock awards, net of forfeitures (shares)	54	'	'	'	'
Foreign currency translation	'	'	-293	'	-293
Actuarial (loss) gain on unfunded pension liability, net of tax of $(207), $48, and $145, respectively	'	'	-318	'	-318
Other	'	-88	'	'	-88
Balance at Sep. 30, 2014	$129	$153,159	$1,307	$347,776	$502,371
Shares Balance at Sep. 30, 2014	12,912	'	'	'	12,912

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Cash Flows From Operating Activities:	'	'	'
Net income	$71,962	$62,849	$53,477
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation and amortization	11,858	10,038	9,062
Amortization of debt issuance costs	39	38	41
Stock-based compensation	5,033	3,553	2,157
Deferred income taxes	1,017	1,410	1,182
Earnings of equity method investees	-342	-337	-318
Distribution from equity method investee	337	'	'
Excess tax benefit of exercise of common stock options and restricted stock vesting	-963	-1,323	-895
(Gain)/loss on disposal of property and equipment	600	-111	-32
Other	91	-280	-206
Changes in operating assets and liabilities (net of effects of business acquisitions):	'	'	'
Receivables	-12,602	-15,173	-48,879
Inventories	-39,201	-72,864	-52,831
Prepaid expenses and other assets	-903	3,135	-1,118
Accounts payable	18,581	63,403	50,018
Accrued expenses	4,358	2,889	2,516
Net cash provided by operating activities	58,665	57,449	14,238
Cash Flows From Investing Activities:	'	'	'
Business acquisitions, net of cash acquired in fiscal year 2014 of $2,549	-102,097	-17,107	-51,718
Purchases of property and equipment	-14,919	-10,780	-7,597
Proceeds from sales of property and equipment	2,216	189	96
Other	-1,243	-430	-646
Net cash used in investing activities	-116,043	-28,128	-59,865
Cash Flows From Financing Activities:	'	'	'
Borrowings on credit facilities	735,867	673,249	539,071
Payments on credit facilities	-676,559	-702,271	-494,186
Proceeds from issuance of common stock	841	651	562
Proceeds from exercise of stock options	72	108	154
Excess tax benefit of exercise of common stock options and restricted stock vesting	963	1,323	895
Tax withholdings on net settlements of share-based awards	-2,120	-1,855	'
Debt issuance costs	'	'	-111
Payment on long-term debt and capital lease obligations	-110	-312	-986
Other	-125	'	'
Net cash provided by/(used in) financing activities	58,829	-29,107	45,399
Effect of Exchange Rate on Cash and Cash Equivalents	29	225	136
Net Increase (Decrease) in Cash and Cash Equivalents	1,480	439	-92
Cash and Cash Equivalents at Beginning of Period	953	514	606
Cash and Cash Equivalents at End of Period	$2,433	$953	$514

CONSOLIDATED_STATEMENTS_OF_CAS1

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Statement Of Cash Flows [Abstract]	'
Cash Acquired from Acquisition	$2,549

Business_Description_and_Basis

Business Description and Basis of Presentation	12 Months Ended
	Sep. 30, 2014
Business Description and Basis of Presentation [Abstract]	'
General	'
	1. Business Description and Basis of Presentation
	MWI Veterinary Supply, Inc. is a leading distributor of animal health products in the United States and United Kingdom. We sell our products in both the companion and production animal markets. As of September 30, 2014,  we operated twenty-three distribution centers located across the United States and one distribution center in the United Kingdom.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2014
Summary of Significant Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2. Summary of Significant Accounting Policies
	Principles of Consolidation — The accompanying consolidated financial statements consist of MWI Veterinary Supply, Inc. and its wholly-owned subsidiaries, collectively referred to herein as “MWI” or the “Company.” All intercompany transactions have been eliminated.  We use the equity method of accounting for our investments in entities in which we have significant influence. Our share of income or loss from these investments is reported as increases or decreases in the respective investment with a corresponding amount reported as other income/(expense).
	Basis of Accounting and Use of Estimates — The accompanying 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 from these estimates. Estimates are used when accounting for allowance for doubtful accounts, customer incentives, vendor rebates, inventories, goodwill and intangible assets, income taxes 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.
	Segment Information — We are a distributor of animal health products, primarily to veterinarians. Our financial results are disclosed as one reportable segment.  We identified two operating segments based on geographic areas but aggregate based on applicable accounting standards.  We determined that the two operating segments have similar operating margins and are expected to maintain this similarity into the future.  Additionally, our products, customers, operations, delivery to market and regulatory environments are all similar in nature.
	Foreign Currency Translation — For our international operations, local currencies have been determined to be the functional currencies.  We translate functional currency assets and liabilities to their U.S. dollar equivalents at rates in effect at the balance sheet date and record these translation adjustments in Stockholders’ Equity – Accumulated Other Comprehensive Income/(Loss).  We translate functional currency statement of income amounts to their U.S. dollar equivalents at average rates for the period.
	Other Comprehensive Income — Comprehensive income includes cumulative foreign currency translation adjustments and actuarial adjustments on pension valuation. As of September 30, 2014, accumulated other comprehensive income is comprised of actuarial adjustments, net of tax, of ($385), and foreign currency translation adjustments of $1,692.
	Revenue Recognition —  We 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 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 $355,773,  $349,006 and $332,343 for the years ended September 30, 2014, 2013 and 2012, respectively, and generated commission revenue of $20,514,  $18,851 and $16,979 for the years ended September 30, 2014, 2013 and 2012, respectively.
	Cost of Product Sales and Vendor Rebates — Cost of product sales consist of our inventory product cost, including direct shipping costs to and from our distribution centers. Costs of fulfillment are included in selling, general and administrative costs. Vendor rebates are recorded based on the terms of the contracts or programs with each vendor. We receive quarterly, semi-annual and 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 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.
	Customer Incentives — 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.
	Cash and Cash Equivalents — Cash equivalents consist of highly liquid investments with a maturity of three months or less from the date of purchase. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment.
	Inventories — Inventories, consisting of pharmaceuticals, vaccines, parasiticides, diagnostics, micro feed ingredients, capital equipment and technology, supplies and nutritional products, are stated at the lower of cost (on a moving-average basis) or market.
	Property and Equipment — Property and equipment are stated at cost and depreciation is computed using the straight-line method over the estimated useful lives, which include the shorter of useful life or lease term for leasehold improvements, of the related assets as follows:
		Buildings	25 to 35 years
		Machinery, furniture and equipment	3 to 15 years
		Computer equipment	3 to 7 years
		Leasehold improvements	1 to 10 years
	The cost and accumulated depreciation of items sold or retired are removed from the property accounts and any resulting gain or loss is reflected in net income. Repairs and maintenance are expensed as incurred and improvements are capitalized.
	We periodically review long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. No impairments were identified during the fiscal years ended September 30, 2014, 2013 and 2012.
	Goodwill and Intangible Assets — We recognize the excess purchase price over the fair value of net assets acquired and liabilities assumed in a business combination as goodwill on the consolidated balance sheet. We perform an annual impairment test on goodwill as of September 30th each year.  We calculate the fair value of each reporting unit using both an income approach and a market approach,  and compare the fair value to its book value.  We have concluded that there was no impairment during the fiscal years ended September 30, 2014, 2013 and 2012. Impairment tests will continue to be performed at least annually and more frequently if circumstances indicate a possible impairment.
	Identifiable intangible assets primarily include customer relationships, trademarks and patents, technology and covenants not to compete and are amortized, as necessary, on a straight-line basis, over their useful lives or contractual term which range from 1-20 years.  We review both indefinite-lived and definite-lived identifiable intangible assets at least annually for impairment or when events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  No impairments were identified during the fiscal years ended September 30, 2014, 2013 and 2012.
	Other Assets — Included in other assets are our equity method investments and investments in entities accounted for under the cost method of accounting. The carrying value of cost method investments was $5,989 and $4,932 at September 30, 2014 and 2013, respectively.  We periodically evaluate these investments for other-than-temporary impairment using both qualitative and quantitative criteria, or when indicators of impairment are noted. In the event an investment is deemed to be other-than-temporarily impaired, we would recognize the loss component in the consolidated statements of income.  Other assets also consist of debt issuance costs that are being amortized over the term of the related debt.
	Earnings Per Common Share — Basic earnings per common share is calculated based on the weighted-average number of outstanding common shares during the applicable period. Diluted earnings per common share is based on the weighted-average number of outstanding common shares plus the weighted-average number of potential outstanding common shares. Potential common shares that would increase earnings per share amounts are antidilutive and are, therefore, excluded from the earnings per common share computations. Earnings per common share is computed separately for each period presented.
	Income Taxes — Income taxes are accounted for under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.
	Deferred tax assets are recognized to the extent that we believe these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.
	We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process whereby (1) we determine whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.
	We recognize interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying Consolidated Statements of Income. Accrued interest and penalties, if any, are included within the related tax liability line in the Consolidated Balance Sheets.
	Concentrations of Risk — Our 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.  These customers in the aggregate accounted for 12.3% and 14.5% of our consolidated accounts receivable balance as of September 30, 2014 and 2013, respectively. 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.
	Advertising — Advertising costs are expensed when incurred and are included as part of selling, general and administrative expenses. Advertising costs were $1,481,  $1,165 and $1,203 in fiscal years 2014, 2013 and 2012, respectively.
	Recently Issued and New Accounting Pronouncements —In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, which requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. This guidance is effective for our fiscal year and interim periods beginning October 1, 2017. We are currently evaluating the effect that adopting this new accounting guidance will have on our consolidated financial statements.

Business_Acquisition

Business Acquisition	12 Months Ended
	Sep. 30, 2014
Business Acquisitions [Abstract]	'
Business Acquisitions	'
	3. Business Acquisitions
	On October 31, 2011, MWI Co. purchased substantially all of the assets of Micro Beef Technologies, Ltd. (“Micro”) for $60,878, including $53,400 in cash and 94,359 shares of common stock valued at $7,158, which is the fair value of the common stock as of the date of acquisition and a working capital adjustment of $320. The $53,400 paid in cash as consideration of Micro was funded with borrowings under our Credit Agreement (as defined in Note 7) as then in effect. Micro is a value-added distributor to the production animal market, including the distribution of micro feed ingredients, pharmaceuticals, vaccines, parasiticides, supplies and other animal health products. Micro also is a leading innovator of proprietary, computerized management systems for the production animal market. We incurred $1,104 of direct acquisition-related and integration expenses.  The intangible assets acquired in the acquisition include technology, customer relationships, trade name and covenant not to compete. The useful life of the amortizing intangible assets ranges from 5 years to 17 years. Trade name is a non-amortizing intangible asset. Goodwill is calculated as the excess of the consideration transferred over the net assets recognized and represents the future economic benefits arising from other assets acquired that could not be individually identified and separately recognized. The goodwill recorded as part of the acquisition of Micro includes the expected synergies that we believed would result from this acquisition.  The amount recorded in goodwill is deductible for tax purposes over 15 years. The fair values assigned to the tangible and intangible assets acquired and liabilities assumed are based on management's estimates and assumptions as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques.
	On December 31, 2012, MWI Co. purchased substantially all of the assets of Prescription Containers, Inc. (“PCI Animal Health”), for a net purchase price of $17,107, after consideration of post-closing adjustments.  PCI Animal Health was a distributor of companion animal health products to veterinary practices, primarily in the Northeastern United States.  The intangible asset acquired in the acquisition is for customer relationships and has a useful life of 10 years.  The amount recorded in goodwill is expected to be deductible for tax purposes over 15 years. The fair values assigned to the tangible and intangible assets acquired and liabilities assumed are based on management's estimates and assumptions, as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques.
	On November 1, 2013, MWI Co. purchased substantially all of the assets of IVESCO Holdings, LLC (“IVESCO”) for a net purchase price of $79,633, after giving effect to post-closing adjustments.  The cash purchase price was funded with borrowings by the Company under its Prior Credit Agreement (as defined herein). IVESCO engaged in the distribution and sale of animal health and related products and services, logistics and technical support relating to such distribution and sale of animal health and related products. The intangible assets acquired in the acquisition include trade name and customer relationships.  The intangible asset representing customer relationships acquired in the acquisition has an estimated useful life of 9 years.  The amount recorded in goodwill is expected to be deductible for tax purposes over 15 years. The fair values assigned to the tangible and intangible assets acquired and liabilities assumed are based on management’s estimates and assumptions as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques.
	On September 2, 2014, MWI Co. purchased all of the outstanding share capital of VetSpace Limited and certain of its affiliates (collectively, VetSpace) for a net purchase price of $25,013.  This transaction is subject to a final post-closing working capital adjustment.  The cash purchase price was funded with borrowings by the Company under its Prior Credit Agreement (as defined herein).  VetSpace is a provider of practice management software to veterinary practices, principally in the United Kingdom.  The intangible assets acquired in the acquisition include trade name and customer relationships, which have useful lives ranging from 10 to 20 year.  The amount recorded in goodwill will not be deductible for tax purposes.  The fair values assigned to the tangible and intangible assets acquired and liabilities assumed are based on management’s estimates and assumptions as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques.
	The following table summarizes the fair values of the assets acquired and liabilities assumed at the date of each acquisition. The fair values for VetSpace may be adjusted during the measurement period as defined in Accounting Standards Codification (“ASC”) 805. These purchase price allocations are based on a combination of valuations and analyses.
		2014		2013		2012
	Cash	$	2,549	$	-	$	1
	Receivables		78,993		3,585		22,374
	Inventories		65,098		1,928		27,701
	Other current assets		491		-		105
	Property and equipment		7,693		-		8,882
	Investments		1,103		-		199
	Goodwill		16,053		9,327		12,473
	Intangibles		13,021		4,780		15,760
	Total assets acquired		185,001		19,620		87,495
	Accounts payable		74,863		2,513		25,026
	Accrued expenses		3,658		-		1,591
	Other liabilities		1,834				-
	Total liabilities assumed		80,355		2,513		26,617
	Net assets acquired	$	104,646	$	17,107	$	60,878
	Revenues and earnings of VetSpace that are included in our consolidated statements of income from the acquisition date of September 2, 2014 through September 30, 2014 are not presented separately as they are not material. Due to the commencement of the integration of IVESCO, it is impracticable to separately present the revenues and earnings of IVESCO that are included in our consolidated statements of income from the acquisition date of November 1, 2013 through September 30, 2014. This information for PCI Animal Health is also not presented as it is impracticable due to the integration of the acquired operations.
	The following table presents information for Micro that is included in our consolidated statements of income from the acquisition date of October 31, 2011 through the fiscal year ended September 30, 2012:
	Micro's operations included in MWI's results
			Fiscal year ended September 30, 2012
	Revenues	$	246,624
	Net Income	$	4,089
	The following table presents supplemental pro forma information for the Company for the years ended September 30, 2014, 2013 and 2012 (unaudited) as if the acquisitions of substantially all of the assets of IVESCO and Micro had occurred on October 1, 2011 (pro forma information is not presented for VetSpace or PCI Animal Health as it is not material):
		Unaudited Pro Forma Consolidated Results
		Fiscal year ended September 30,
		2014		2013		2012
	Revenues	$	3,031,030	$	2,849,712	$	2,586,351
	Net Income	$	71,963	$	66,521	$	57,143
	The unaudited pro forma consolidated results are not necessarily indicative of what our consolidated results of operations would have been had we completed the acquisitions on October 1, 2011.  Additionally, the unaudited pro forma consolidated results do not purport to project the future results of operations of the combined company.

Receivables

Receivables	12 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Receivables	'
	4. Receivables
	Receivables consist of the following at September 30:
		2014		2013
	Trade	$	358,757	$	282,923
	Vendor rebates and programs		43,179		26,983
			401,936		309,906
	Allowance for doubtful accounts		-2,946		-2,461
		$	398,990	$	307,445

Property_and_Equipment

Property and Equipment	12 Months Ended
	Sep. 30, 2014
Property And Equipment [Abstract]	'
Property And Equipment	'
	5. Property and Equipment
	Property and equipment consists of the following at September 30:
		2014		2013
	Land	$	2,023	$	1,932
	Building and leasehold improvements		17,351		14,914
	Machinery, furniture and equipment		44,877		38,032
	Computer equipment		17,374		9,868
	Construction in progress		5,641		4,328
			87,266		69,074
	Accumulated depreciation and amortization		-37,116		-29,891
		$	50,150	$	39,183
	We recorded depreciation expense of $8,489,  $6,974 and $6,210 for the years ended September 30, 2014, 2013 and 2012, respectively.

Goodwill_and_Intangibles

Goodwill and Intangibles	12 Months Ended
	Sep. 30, 2014
Goodwill and Intangibles [Abstract]	'
Goodwill and Intangibles	'
	6.  Goodwill and Intangibles
	The changes in the carrying value of goodwill for the fiscal years ended September 30, are as follows:
		2014		2013
	Goodwill - Beginning of year	$	71,150	$	61,841
	Acquisition activity		16,053		9,327
	Foreign exchange translation		-322		-18
	Goodwill - End of year	$	86,881	$	71,150
	Balances of intangibles are as follows:
			Estimated
			Useful Lives	30-Sep-14
	Amortizing:			Cost		Accumulated Amortization		Net
	Customer relationships		9 - 20 years	$	45,860	$	-10,899	$	34,961
	Covenants not to compete		1 - 5 years		372		-163		209
	Technology		11 years		5,830		-1,546		4,284
	Other		2 - 10 years		1,627		-1,072		555
					53,689		-13,680		40,009
	Non-Amortizing:
	Trade names and patents				10,084		-		10,084
				$	63,773	$	-13,680	$	50,093
			Estimated
			Useful Lives	30-Sep-13
	Amortizing:			Cost		Accumulated Amortization		Net
	Customer relationships		9 - 20 years	$	35,797	$	-8,393	$	27,404
	Covenants not to compete		1 - 5 years		450		-185		265
	Technology		11 years		5,830		-1,016		4,814
	Other		2 - 7 years		1,126		-794		332
					43,203		-10,388		32,815
	Non-Amortizing:
	Trade names and patents				7,675		-		7,675
				$	50,878	$	-10,388	$	40,490
	We recorded amortization expense of $3,368,  $3,064 and $2,852 for the years ended September 30, 2014, 2013 and 2012, respectively.  Estimated future amortization expense related to intangible assets as of September 30, 2014 is as follows:
		Amount
	2015	$	3,438
	2016		3,316
	2017		3,237
	2018		3,212
	2019		3,041
	Thereafter		23,765
		$	40,009

Debt

Debt	12 Months Ended
	Sep. 30, 2014
Debt [Abstract]	'
Debt	'
	7. Debt
		2014		2013
	Revolving credit facility, 1.03% as of September 30, 2014	$	78,200	$	16,300
	Sterling revolving credit facility		-		2,501
	Capital lease obligations (1)		1		119
	Total debt and capital lease obligations		78,201		18,920
	Less: Long-term portion of capital lease obligations		-		-16
	Total debt and capital lease obligations included in current liabilities	$	78,201	$	18,904
	(1) The capital lease obligations have varying maturity dates.
	Revolving Credit Facility — MWI Co., as borrower, was party to a Credit Agreement dated December 13, 2006, as amended (the “Prior Credit Agreement”), by and among MWI Co., MWI, and Memorial Pet Care, Inc. and Bank of America, N.A. and Wells Fargo Bank, N.A. as lenders (collectively, the “Lenders”).  The Prior Credit Agreement allowed for an aggregate revolving commitment of the Lenders of $200,000 and a maturity date of November 1, 2016.  Under the Prior Credit Agreement, the margin on variable interest rate borrowings ranged from 0.95% to 1.50%.  The commitment fee under the Credit Agreement ranged from 0.15% to 0.25% depending on the funded debt to EBITDA ratio.  The variable interest rate was equal to the Daily LIBOR Floating Rate or the LIBOR 1-month, 2-month, 3-month or 6-month fixed rate (at MWI Co.’s option) plus the margin.  The Credit Agreement contained financial covenants, including a fixed charge ratio and a funded debt to EBITDA ratio.  We were in compliance with all of the covenants as of September 30, 2014 and 2013.
	On October 2, 2014, MWI Co., as borrower, entered into an Amended and Restated Credit Agreement (the “Amended Credit Agreement”), with MWI and Memorial Pet Care, Inc., as guarantors and the Lenders.  The Amended Credit Agreement allows for an aggregate revolving commitment of the Lenders of $230,000 and includes a $45,000 sublimit for borrowings in alternative currencies.  The Amended Credit Agreement has a maturity date of October 2, 2019.  Under the Amended Credit Agreement, the margin on variable interest rate borrowings ranges from 0.95% to 1.50%.  The commitment fee under the Amended Credit Agreement ranges from 0.15% to 0.25% depending on the funded debt to EBITDA ratio.  The variable interest rate on borrowings in dollars, euros or British pounds is equal to the Daily LIBOR Floating Rate or the LIBOR 1-month, 2-month, 3-month or 6-month fixed rate (at MWI Co.’s option) plus the margin.  The Amended Credit Agreement contains financial covenants, including an interest charge coverage ratio and a funded debt to EBITDA ratio.
	The Amended Credit Agreement replaces the Prior Credit Agreement.
	Sterling Revolving Credit Facility— On March 15, 2013, Centaur entered into a First Amendment (the “Amendment”) to the unsecured revolving line of credit facility (the “Sterling Revolving Credit Facility”) dated November 5, 2010 with Wells Fargo Bank, N.A. London Branch.  The Amendment increases the maximum loan amount of the Sterling Revolving Credit Facility to £20,000, an increase of £7,500, and extends the term of the facility to November 1, 2016. Interest is based on LIBOR for the applicable interest period plus an applicable margin of 0.95% to 1.50%, and the commitment fee ranges from 0.15% to 0.25%, depending on our funded debt to EBITDA ratio.  The facility contains a financial covenant requiring Centaur to maintain a minimum tangible net worth of £5,000.  As of September 30, 2014 and 2013, Centaur was in compliance with the covenant.
	Also on March 15, 2013, Centaur entered into an uncommitted overdraft facility (the “Overdraft Facility”) with Wells Fargo. The Overdraft Facility allows Centaur to borrow an additional £10,000 to fund short term normal trading cycle fluctuations. The Overdraft Facility will expire on November 1, 2016.  Interest on the borrowing under the Overdraft Facility is the same as the terms under the Sterling Revolving Credit Facility.
	MWI Co. guarantees the obligations of Centaur under the Sterling Revolving Credit Facility and the Overdraft Facility.

Common_Stock_and_StockBased_Aw

Common Stock and Stock-Based Awards	12 Months Ended
	Sep. 30, 2014
Common Stock and Stock-Based Awards [Abstract]	'
Common Stock and Stock-Based Awards	'
	8. Common Stock and Stock-Based Awards
	2002 Stock Plan
	We had a 2002 Stock Plan (the “2002 Plan”) to provide our directors, executives and other key employees with additional incentives by allowing them to acquire an ownership interest in us and, as a result, encouraging them to contribute to our success. All options that were granted under this plan have been exercised and there are no additional shares available for issuance under the 2002 Plan.
	2005 Stock Plan
	We have a 2005 Stock-Based Award and Incentive Compensation Plan (the “2005 Plan”), under which we may offer restricted shares of our common stock and grant options to purchase shares of our common stock to selected employees and non-employee directors. The purpose of the 2005 Plan is to promote our long-term financial success by attracting, retaining and rewarding eligible participants. At September 30, 2014 and 2013 we had 757,588 and 815,260 shares, respectively, of our common stock available for issuance under the 2005 Plan.
	The 2005 Plan permits us to grant stock options (both incentive stock options and non‑qualified stock options), restricted stock and deferred stock. The compensation committee will determine the number and type of stock-based awards to each participant, the exercise price of each award, the duration of the award (not to exceed ten years), vesting provisions and all other terms and conditions of such award in individual award agreements. The 2005 Plan provides for the cancellation of all unvested awards upon termination of employment with us, unless determined otherwise by the compensation committee at the time awards are granted.
	A summary of common stock options activity under the 2002 and 2005 Plans is as follows:
			2014						2013						2012
					Weighted							Weighted						Weighted
			Number		average				Number			average			Number			average
			of		exercise				of			exercise			of			exercise
			Shares		price				Shares			price			Shares			price
	Outstanding at beginning of year		16,038		$	17.58				22,360		$	17.53			37,385		$	14.73
	Exercised		-4,030			17.84				-6,186			17.43			-14,769			10.44
	Cancelled or expired		-74			17.00				-136			17.00			-256			17.00
	Outstanding at end of year		11,934		$	17.49				16,038		$	17.58			22,360		$	17.53
	Exercisable at end of year		11,934		$	17.49				16,038		$	17.58			22,360		$	17.53
		Outstanding and exercisable options
					Weighted
					average
					remaining		Weighted
					contractual		average
			Number of		life		exercise
	Range of exercise prices		Shares		(in years)		price
	$17.00 - $19.99		10,774		0.8		$	17.00
	$20.00 - $22.60		1,160		1.0		$	22.05
	The intrinsic value of the shares outstanding and exercisable was $1,562 as of September 30, 2014 and $2,114 as of September 30, 2013. The total intrinsic value of options exercised during the years ended September 30, 2014, 2013 and 2012 was  $553,  $644, and $1,105, respectively.
	A summary of restricted stock awards activity under the 2005 Plan is as follows:
		2014						2013						2012
				Weighted							Weighted						Weighted
		Number		average				Number			average			Number			average
		of		grant date				of			grant date			of			grant date
		Shares		fair value				Shares			fair value			Shares			fair value
	Nonvested at beginning of year	142,244		$	83.13				129,396		$	69.94			105,540		$	61.69
	Granted	76,555			148.10				70,575			145.65			74,848			101.97
	Vested	-47,154			104.72				-44,547			144.52			-48,072			102.09
	Forfeitures	-8,107			110.64				-13,180			80.96			-2,920			63.49
	Nonvested at end of year	163,538		$	132.04				142,244		$	83.13			129,396		$	69.94
	As of September 30, 2014, total unrecognized stock based compensation expense related to nonvested awards was approximately $21,319 before income taxes, which is expected to be recognized over the remaining term of the awards which range from 1 to 5 years.  During the fiscal years ended September 30, 2014 and 2013, we recognized $5,033 and $3,553, respectively, in compensation expense related to common stock awards.  The total fair value of shares vested during the years ended September 30, 2014, 2013, and 2012, was $7,020,  $6,438, and $4,908, respectively.
	2008 Employee Stock Purchase Plan
	The 2008 Employee Stock Purchase Plan (the “ESPP”) allows substantially all employees to purchase shares of our common stock at 95% of the fair market value on the date of purchase.  The purchase date is the last trading date of the purchase period, which begins in March, June, September and December.  Employees accumulate amounts through payroll deductions during the purchase period of between 1% and 10% but no more than $20 annually.  An employee is allowed to purchase a maximum of 200 shares per purchase period.  We issued 5,764  and 5,396 shares of our common stock under the ESPP during fiscal years ended September 30, 2014 and 2013, respectively.

Computation_of_Earnings_per_Sh

Computation of Earnings per Share	12 Months Ended
	Sep. 30, 2014
Computation Of Earnings Per Common Share [Abstract]	'
Computation Of Earnings Per Common Share	'
	9. Computation of Earnings per Common Share (In thousands, except per share data)
		2014				2013				2012
		Basic		Diluted		Basic		Diluted		Basic		Diluted
	Net income	$	71,962	$	71,962	$	62,849	$	62,849	$	53,477	$	53,477
	Weighted average common
	shares outstanding		12,715		12,715		12,675		12,675		12,616		12,616
	Effect of dilutive securities
	Stock options and restricted stock				30				34				31
	Weighted average shares
	outstanding				12,745				12,709				12,647
	Earnings per share	$	5.66	$	5.65	$	4.96	$	4.95	$	4.24	$	4.23
	Anti-dilutive shares excluded from calculation				3				-				-

Income_Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	10. Income Taxes
	Income before taxes is as follows:
		2014			2013		2012
	Income before taxes
	United States	$	115,545		$	96,915	$	81,482
	Foreign		2,160			3,766		4,458
	Total income before taxes	$	117,705		$	100,681	$	85,940
	The components of income tax expense consist of the following:
		2014			2013		2012
	United States
	Current payable
	Federal	$	36,585		$	30,200	$	25,535
	State		6,875			4,952		4,494
	Deferred
	Federal		1,216			1,652		1,308
	State		302			253		220
	Total U.S. tax expense		44,978			37,057		31,557
	International
	Current payable		1,265			1,275		1,252
	Deferred		-500			-500		-346
	Total foreign tax expense		765			775		906
	Total income tax expense	$	45,743		$	37,832	$	32,463
	Our deferred tax assets and liabilities consist of the following at September 30:
		2014			2013
	Deferred tax assets:
	Allowance for doubtful accounts	$	1,061		$	866
	Inventories		942			658
	Lease expense		713			544
	Employee benefits		599			334
	Acquisition-related costs		-			444
	Other		416			164
	Total deferred tax assets		3,731			3,010
	Deferred tax liabilities:
	Investments		-1,414			-786
	Property and equipment		-11,808			-8,876
	Prepaid expenses		-299			-227
	Other		-			-115
	Total deferred tax liabilities		-13,521			-10,004
	Net deferred liabilities	$	-9,790		$	-6,994
	Other deferred tax assets totaling $760 and $711  as of September 30, 2014 and 2013, respectively, arising from the Company’s foreign subsidiary, are subject to full valuation allowance.
	Income tax expense differed from income taxes at the U.S. federal statutory tax rate for all periods presented as follows:
		2014		2013		2012
	Taxes computed at statutory rate	35.0%		35.0%		35.0%
	State income taxes (net of federal income tax benefit)	4.0		3.4		3.6
	Foreign	-0.3		-0.9		-1.1
	Other	0.2		0.1		0.3
		38.9%		37.6%		37.8%
	In general, it is the practice and intention of the Company to reinvest the earnings of its non-U.S. subsidiaries in those operations.  We consider the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested as of September 30, 2014 and, accordingly, no provision for U.S. income taxes has been made with respect to any such amounts.  As of September 30, 2014, the amount of cash and cash equivalents associated with indefinitely reinvested foreign earnings was approximately $2,192.  We have not, nor do we anticipate the need to, repatriate funds to the United States to satisfy domestic liquidity needs arising in the ordinary course of business, including liquidity needs associated with our domestic debt service requirements. In the event that these funds are repatriated, such amounts would be subject to income tax liabilities in the United States.  It is not practicable to estimate the amount of deferred tax liability related to investments in foreign subsidiaries because of the complexities of the hypothetical calculation.
	A reconciliation of the unrecognized tax benefits is as follows:
		2014			2013		2012
	Unrecognized tax benefits – Beginning of year	$	-		$	-	$	23
	Gross increases related to prior period tax positions		-			-		-
	Gross decreases related to prior period tax positions		-			-		-8
	Gross increases related to current period tax positions		-			-		-
	Settlements		-			-		-15
	Unrecognized tax benefits – End of year	$	-		$	-	$	-
	For the fiscal years ended September 30, 2014, 2013 and 2012, the amount included in our income tax expense for tax-related interest and penalties was not significant.  We expect no material changes to our unrecognized tax benefits during the next fiscal year.
	With few exceptions, we are no longer subject to income tax examination for years before 2010 in the U.S. and significant state and local jurisdictions.  We are no longer subject to income tax examinations for years before 2012 in significant foreign jurisdictions.

Statements_of_Cash_flows_Suppl

Statements of Cash flows - Supplemental and Non-Cash Disclosures	12 Months Ended
	Sep. 30, 2014
Statements of Cash Flows — Supplemental and Noncash Disclosures [Abstract]	'
Statements of Cash Flows — Supplemental and Noncash Disclosures	'
	11. Statements of Cash Flows — Supplemental and Noncash Disclosures
		2014		2013		2012
	Supplemental Disclosures
	Cash paid for interest	$	1,110	$	620	$	788
	Cash paid for income taxes		45,117		34,045		31,025
	Noncash Investing and Financing Activities
	Issuance of restricted common stock for asset acquisition		-		-		7,158
	Capital lease asset additions and related obligations		-		-		165
	Property and equipment acquisitions financed with accounts payable		364		265		192

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	12. Commitments and Contingencies
	From time to time, in the normal course of business, we may become a party to legal proceedings that may have an adverse effect on our financial position, results of operations and cash flow.  Except as set forth below, at September 30, 2014, we were not a party to any material pending legal proceedings and were not aware of any claims that individually or in the aggregate could have a material adverse effect on our financial position, results of operations or cash flows.
	On July 30, 2014, Ealena Callender, a purported stockholder of the Company, brought a derivative lawsuit in the Court of Chancery of the State of Delaware against the Company as nominal defendant and against each of the Company’s directors, as well as a former director, as defendants, alleging breach of fiduciary duty and unjust enrichment relating to the Company’s non-employee director stock grants made between 2012 and 2014.  The complaint alleges that the directors breached their fiduciary duties by issuing stock grants that were inconsistent with the terms of the Company’s Amended and Restated 2005 Stock-Based Incentive Compensation Plan.  The complaint seeks rescission of a total of 16,505 shares of common stock issued to the directors as well as damages plus pre-judgment and post-judgment interest.  The Company believes that the allegations in the complaint are without merit.
	We have operating leases for office and distribution center space and equipment for varying periods. We also lease some of our vehicles in the United Kingdom under capital leases.  Certain leases have renewal options and require contingent payments for increases, including executory costs, property taxes, insurance and certain other costs in excess of a base year amount. Total rent expense for the years ended September 30, 2014, 2013 and 2012 were $8,494,  $6,301 and $5,382, respectively.
	The aggregate future noncancelable minimum rental payments on operating leases and capital leases at September 30, 2014 are as follows:
		Lease Obligations
	Fiscal Year	Operating Leases		Capital Leases
	2015	$	8,515	$	1
	2016		8,218
	2017		7,649
	2018		7,070
	2019		5,976
	Thereafter		16,583
	Total future minimum obligations	$	54,011	$	1

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income [Abstract]	'
Accumulated Other Comprehensive Income	'
	13. Accumulated Other Comprehensive Income
	Changes in accumulated other comprehensive income consisted of the following:
		Year Ended September 30,
		2014		2013		2012
	Balance, beginning of period	$	1,918	$	1,542	$	-563
	Foreign currency translation gain (loss) in
	other comprehensive income		-293		237		1,877
	Actuarial (loss) gain on unfunded pension liability
	net of tax of $(207),  $48, and $145, respectively		-318		139		228
	Balance, end of period	$	1,307	$	1,918	$	1,542

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	14. Related Party Transactions
	MWI Co. holds a 50% membership interest in Feeders’ Advantage that is accounted for as an investment using the equity method. Sales of products to Feeders’ Advantage, which are at our cost, were $68,501,  $68,355 and $61,873 for the fiscal years ended September 30, 2014, 2013 and 2012, respectively. MWI Co. charged Feeders’ Advantage for certain operating and administrative services of $1,097,  $1,079 and $1,008 for the fiscal years ended September 30, 2014, 2013 and 2012, respectively. Our President and Chief Executive Officer and a member of our Board of  Directors are each members of the Board of Managers of Feeders’ Advantage.
	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.  As of September 30, 2014 and 2013 MWI Co. had a payable balance to Feeders’ Advantage of $1,495 and $777, respectively.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Sep. 30, 2014
Employee Benefit Plans [Abstract]	'
Employee Benefit Plans	'
	15. Employee Benefit Plans
	We have a multi-employer defined contribution profit sharing plan with a 401(k) arrangement for employees in the United States.  To become eligible for the profit sharing portion of the plan, an employee must complete two years of service and attain the age of twenty-one. Participation is automatic beginning the following January or July. To become eligible for the 401(k) portion of the plan, the employee must complete three-months of service and attain the age of twenty-one.
	Both portions of the plan allow for employer contributions. We match 50% of the employee’s contribution to the 401(k) portion of the plan up to 6% of the employee’s salary, at management’s discretion. Our matching contributions for the 401(k) portion of the plan were $2,451,  $2,122 and $1,871 for the fiscal years ended September 30, 2014, 2013 and 2012, respectively. Employee’s contributions are fully vested immediately while employer contributions vest over a five-year period.
	Contributions to the profit sharing portion of the Plans are discretionary, ranging from 0% to 3%, and are approved by our Board of Directors. Total profit sharing expense for the fiscal years ended September 30, 2014, 2013 and 2012 were $2,203,  $1,997 and $1,847, respectively. Employer contributions are fully vested immediately.
	Centaur sponsors a defined contribution plan for all other staff not participating in the defined benefit plan described below. The contributions made by the employer over the period are detailed below. Contributions are currently payable at a minimum of 3% up to a maximum of 6% of eligible pay if matched by employee.  The matching contribution for the plan was $278,  $257 and $250 for the fiscal years ended September 30, 2014, 2013 and 2012, respectively.
	Centaur operates a defined benefit pension plan which provides benefits based on pensionable pay and is closed to future benefit accrual.
	The fair value of plan assets, benefit obligation and funded status of the defined benefit plan as of September 30 is as follows:
		2014			2013			2012
	Fair value of plan assets	$	5,732		$	5,242		$	5,329
	Benefit obligation		-7,574			-6,667			-7,228
	Unfunded pension liability	$	-1,842		$	-1,425		$	-1,899
	The unfunded pension liability is recognized as other long-term liabilities in the Consolidated Balance Sheets.  Net periodic benefit expense for the fiscal year ended September 30 consisted of the following:
		2014			2013			2012
	Interest cost	$	234		$	195		$	219
	Expected return on plan assets		-322			-252			-249
	Net periodic cost		-88			-57			-30
	Other changes recognized in other comprehensive income
	Actuarial loss (gain)		666			-187			-373
	Total recognized in net periodic benefit costs and
	other comprehensive income	$	578		$	-244		$	-403
	Total loss (gain) recognized in other comprehensive income, net of tax	$	318		$	-139		$	-228
	The estimated net actuarial gain that will be amortized from accumulated other comprehensive income into net periodic benefit costs during fiscal year 2014 is not significant.  The following table provides the weighted-average actuarial assumptions:
			2014		2013
	Assumptions used to determine benefit obligations
	Discount rate		3.1%		3.6%
	Rate of compensation increase (1)		N/A		N/A
			2014		2013		2012
	Assumptions used to determine net periodic benefit cost
	Discount rate		3.6%		3.0%		3.1%
	Expected return on plan assets		6.0%		5.0%		5.2%
	Rate of compensation increase (1)		N/A		N/A		N/A
	(1) There is no assumed rate of compensation increase as there have been no current active members since April 2006.
	The following table sets forth, by level within the fair value hierarchy, as discussed in Note 15, Fair Value of Financial Instruments, the assets of the plan, by major asset category, at fair value as of September 30:
			2014							2013
			Market			Asset		Fair Value		Market		Asset	Fair Value
	Asset Class		Value			Allocation		Level		Value		Allocation	Level
	Equities		$	2,418		42%		2		$	2,062	39%	2
	Corporate bonds			822		14%		2			979	19%	2
	Cash			152		3%		1			82	2%	1
	Other assets			2,340		41%		2			2,119	40%	2
	Total		$	5,732		100%				$	5,242	100%

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	12 Months Ended
	Sep. 30, 2014
Fair Value of Financial Instruments [Abstract]	'
Fair Value of Financial Instruments	'
	16. Fair Value of Financial Instruments
	Current fair value accounting guidance includes a hierarchy that is intended to increase consistency and comparability in fair value measurements and disclosures.  This hierarchy prioritizes inputs to valuation techniques based on observable and unobservable data.  The guidance categorizes these inputs used in measuring fair value into three levels which include the following:
		·	Level 1 – observable inputs such as quoted prices in active markets;
		·	Level 2 – inputs, other than quoted prices, that are observable for the asset or liability, either directly or indirectly.  These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active; and
		·	Level 3 – unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	As of September 30, 2014 and 2013, financial instruments include cash and cash equivalents, receivables and accounts payable, and the fair values approximate book values due to their short maturities.
	Our revolving credit facilities in the United States and in the United Kingdom were amended in the recent past and are based on market conditions such as LIBOR.  Because these credit facilities include interest rates based on current market conditions (Level 1 inputs), we believe that the estimated fair value of our debt was materially the same as our carrying value.

Geographic_Information

Geographic Information	12 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Geographic Information	'
	17. Geographic Information
	Revenues and long-lived assets by geographic region are as follows:
		2014		2013		2012
	Revenues for the fiscal years ended September 30
	United States	$	2,651,818	$	2,032,260	$	1,776,414
	International		329,220		315,225		298,732
	Total	$	2,981,038	$	2,347,485	$	2,075,146
	Long-lived assets as of September 30
	United States	$	40,306	$	32,881	$	29,001
	International		9,844		6,302		6,783
	Total	$	50,150	$	39,183	$	35,784

Quarterly_Financial_Data

Quarterly Financial Data	12 Months Ended
	Sep. 30, 2014
Quarterly Financial Data [Abstract]	'
Quarterly Financial Data	'
	18. Quarterly Financial Data (Unaudited)
		Three-Months Ended
		Dec. 31,		Mar. 31,		June 30,		Sept. 30,		Year (1)
			(Dollars and shares in thousands, except per share data)
	Fiscal Year 2014
	Total revenues	$	687,259	$	721,272	$	778,448	$	794,059	$	2,981,038
	Gross profit		89,088		91,060		97,475		93,690		371,313
	Operating income		30,206		27,431		31,329		28,793		117,760
	Net income		18,439		16,776		19,365		17,382		71,962
	Earnings per common share — basic	$	1.45	$	1.32	$	1.52	$	1.37	$	5.66
	Earnings per common share — diluted	$	1.45	$	1.32	$	1.52	$	1.36	$	5.65
	Weighted average common shares
	outstanding:
	Basic		12,707		12,712		12,718		12,722		12,715
	Diluted		12,743		12,748		12,744		12,747		12,745
	Fiscal Year 2013
	Total revenues	$	572,848	$	563,114	$	606,443	$	605,080	$	2,347,485
	Gross profit		76,929		74,679		77,511		75,219		304,338
	Operating income		27,077		24,238		26,534		22,473		100,323
	Net income		16,751		15,100		16,781		14,217		62,849
	Earnings per common share — basic	$	1.32	$	1.19	$	1.32	$	1.12	$	4.96
	Earnings per common share — diluted	$	1.32	$	1.19	$	1.32	$	1.12	$	4.95
	Weighted average common shares
	outstanding:
	Basic		12,665		12,674		12,679		12,683		12,675
	Diluted		12,695		12,709		12,713		12,721		12,709
	(1) The sums of the quarterly amounts may not agree to the year-to-date amount as a result of rounding.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2014
Summary of Significant Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation — The accompanying consolidated financial statements consist of MWI Veterinary Supply, Inc. and its wholly-owned subsidiaries, collectively referred to herein as “MWI” or the “Company.” All intercompany transactions have been eliminated.  We use the equity method of accounting for our investments in entities in which we have significant influence. Our share of income or loss from these investments is reported as increases or decreases in the respective investment with a corresponding amount reported as other income/(expense).
Basis of Accounting and Use of Estimates	'
	Basis of Accounting and Use of Estimates — The accompanying 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 from these estimates. Estimates are used when accounting for allowance for doubtful accounts, customer incentives, vendor rebates, inventories, goodwill and intangible assets, income taxes 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.
Segment Information	'
	Segment Information — We are a distributor of animal health products, primarily to veterinarians. Our financial results are disclosed as one reportable segment.  We identified two operating segments based on geographic areas but aggregate based on applicable accounting standards.  We determined that the two operating segments have similar operating margins and are expected to maintain this similarity into the future.  Additionally, our products, customers, operations, delivery to market and regulatory environments are all similar in nature.
Foreign Currency Translation	'
	Foreign Currency Translation — For our international operations, local currencies have been determined to be the functional currencies.  We translate functional currency assets and liabilities to their U.S. dollar equivalents at rates in effect at the balance sheet date and record these translation adjustments in Stockholders’ Equity – Accumulated Other Comprehensive Income/(Loss).  We translate functional currency statement of income amounts to their U.S. dollar equivalents at average rates for the period.
Other Comprehensive Income	'
	Other Comprehensive Income — Comprehensive income includes cumulative foreign currency translation adjustments and actuarial adjustments on pension valuation. As of September 30, 2014, accumulated other comprehensive income is comprised of actuarial adjustments, net of tax, of ($385), and foreign currency translation adjustments of $1,692.
Revenue Recognition	'
	Revenue Recognition —  We 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 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 $355,773,  $349,006 and $332,343 for the years ended September 30, 2014, 2013 and 2012, respectively, and generated commission revenue of $20,514,  $18,851 and $16,979 for the years ended September 30, 2014, 2013 and 2012, respectively.
Cost of Product Sales and Vendor Rebates	'
	Cost of Product Sales and Vendor Rebates — Cost of product sales consist of our inventory product cost, including direct shipping costs to and from our distribution centers. Costs of fulfillment are included in selling, general and administrative costs. Vendor rebates are recorded based on the terms of the contracts or programs with each vendor. We receive quarterly, semi-annual and 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 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.
Customer Incentives	'
	Customer Incentives — 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.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents — Cash equivalents consist of highly liquid investments with a maturity of three months or less from the date of purchase. Our banking arrangements allow us to fund outstanding checks when presented to the financial institution for payment.
Inventories	'
	Inventories — Inventories, consisting of pharmaceuticals, vaccines, parasiticides, diagnostics, micro feed ingredients, capital equipment and technology, supplies and nutritional products, are stated at the lower of cost (on a moving-average basis) or market.
Property and Equipment	'
	Property and Equipment — Property and equipment are stated at cost and depreciation is computed using the straight-line method over the estimated useful lives, which include the shorter of useful life or lease term for leasehold improvements, of the related assets as follows:
		Buildings	25 to 35 years
		Machinery, furniture and equipment	3 to 15 years
		Computer equipment	3 to 7 years
		Leasehold improvements	1 to 10 years
	The cost and accumulated depreciation of items sold or retired are removed from the property accounts and any resulting gain or loss is reflected in net income. Repairs and maintenance are expensed as incurred and improvements are capitalized.
	We periodically review long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. No impairments were identified during the fiscal years ended September 30, 2014, 2013 and 2012.
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets — We recognize the excess purchase price over the fair value of net assets acquired and liabilities assumed in a business combination as goodwill on the consolidated balance sheet. We perform an annual impairment test on goodwill as of September 30th each year.  We calculate the fair value of each reporting unit using both an income approach and a market approach,  and compare the fair value to its book value.  We have concluded that there was no impairment during the fiscal years ended September 30, 2014, 2013 and 2012. Impairment tests will continue to be performed at least annually and more frequently if circumstances indicate a possible impairment.
	Identifiable intangible assets primarily include customer relationships, trademarks and patents, technology and covenants not to compete and are amortized, as necessary, on a straight-line basis, over their useful lives or contractual term which range from 1-20 years.  We review both indefinite-lived and definite-lived identifiable intangible assets at least annually for impairment or when events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.  No impairments were identified during the fiscal years ended September 30, 2014, 2013 and 2012.
Other Assets	'
	Other Assets — Included in other assets are our equity method investments and investments in entities accounted for under the cost method of accounting. The carrying value of cost method investments was $5,989 and $4,932 at September 30, 2014 and 2013, respectively.  We periodically evaluate these investments for other-than-temporary impairment using both qualitative and quantitative criteria, or when indicators of impairment are noted. In the event an investment is deemed to be other-than-temporarily impaired, we would recognize the loss component in the consolidated statements of income.  Other assets also consist of debt issuance costs that are being amortized over the term of the related debt.
Earnings Per Common Share	'
	Earnings Per Common Share — Basic earnings per common share is calculated based on the weighted-average number of outstanding common shares during the applicable period. Diluted earnings per common share is based on the weighted-average number of outstanding common shares plus the weighted-average number of potential outstanding common shares. Potential common shares that would increase earnings per share amounts are antidilutive and are, therefore, excluded from the earnings per common share computations. Earnings per common share is computed separately for each period presented.
Income Taxes	'
	Income Taxes — Income taxes are accounted for under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.
	Deferred tax assets are recognized to the extent that we believe these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.
	We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process whereby (1) we determine whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.
	We recognize interest and penalties related to unrecognized tax benefits within the income tax expense line in the accompanying Consolidated Statements of Income. Accrued interest and penalties, if any, are included within the related tax liability line in the Consolidated Balance Sheets.
Concentrations of Risk	'
	Concentrations of Risk — Our 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.  These customers in the aggregate accounted for 12.3% and 14.5% of our consolidated accounts receivable balance as of September 30, 2014 and 2013, respectively. 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.
Advertising	'
	Advertising — Advertising costs are expensed when incurred and are included as part of selling, general and administrative expenses. Advertising costs were $1,481,  $1,165 and $1,203 in fiscal years 2014, 2013 and 2012, respectively.
Recently Issued and New Accounting Pronouncements	'
	Recently Issued and New Accounting Pronouncements —In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, which requires entities to recognize revenue in a way that depicts the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. This guidance is effective for our fiscal year and interim periods beginning October 1, 2017. We are currently evaluating the effect that adopting this new accounting guidance will have on our consolidated financial statements.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Table)	12 Months Ended
	Sep. 30, 2014
Summary of Significant Accounting Policies [Abstract]	'
Property and Equipment, Estimated Useful Lives	'
		Buildings	25 to 35 years
		Machinery, furniture and equipment	3 to 15 years
		Computer equipment	3 to 7 years
		Leasehold improvements	1 to 10 years

Business_Acquisitions_Tables

Business Acquisitions (Tables)	12 Months Ended
	Sep. 30, 2014
Business Acquisitions [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
		2014		2013		2012
	Cash	$	2,549	$	-	$	1
	Receivables		78,993		3,585		22,374
	Inventories		65,098		1,928		27,701
	Other current assets		491		-		105
	Property and equipment		7,693		-		8,882
	Investments		1,103		-		199
	Goodwill		16,053		9,327		12,473
	Intangibles		13,021		4,780		15,760
	Total assets acquired		185,001		19,620		87,495
	Accounts payable		74,863		2,513		25,026
	Accrued expenses		3,658		-		1,591
	Other liabilities		1,834				-
	Total liabilities assumed		80,355		2,513		26,617
	Net assets acquired	$	104,646	$	17,107	$	60,878
Information Included in Statements of Income	'
	Micro's operations included in MWI's results
			Fiscal year ended September 30, 2012
	Revenues	$	246,624
	Net Income	$	4,089
Business Acquisition Pro Forma Information	'
		Unaudited Pro Forma Consolidated Results
		Fiscal year ended September 30,
		2014		2013		2012
	Revenues	$	3,031,030	$	2,849,712	$	2,586,351
	Net Income	$	71,963	$	66,521	$	57,143

Receivables_Table

Receivables (Table)	12 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Schedule Of Accounts Receivable	'
		2014		2013
	Trade	$	358,757	$	282,923
	Vendor rebates and programs		43,179		26,983
			401,936		309,906
	Allowance for doubtful accounts		-2,946		-2,461
		$	398,990	$	307,445

Property_and_Equipment_Table

Property and Equipment (Table)	12 Months Ended
	Sep. 30, 2014
Property And Equipment [Abstract]	'
Property And Equipment	'
		2014		2013
	Land	$	2,023	$	1,932
	Building and leasehold improvements		17,351		14,914
	Machinery, furniture and equipment		44,877		38,032
	Computer equipment		17,374		9,868
	Construction in progress		5,641		4,328
			87,266		69,074
	Accumulated depreciation and amortization		-37,116		-29,891
		$	50,150	$	39,183

Goodwill_and_Intangibles_Table

Goodwill and Intangibles (Tables)	12 Months Ended
	Sep. 30, 2014
Goodwill and Intangibles [Abstract]	'
Changes in the Carrying Value of Goodwill	'
		2014		2013
	Goodwill - Beginning of year	$	71,150	$	61,841
	Acquisition activity		16,053		9,327
	Foreign exchange translation		-322		-18
	Goodwill - End of year	$	86,881	$	71,150
Schedule of Intangible Assets	'
			Estimated
			Useful Lives	30-Sep-14
	Amortizing:			Cost		Accumulated Amortization		Net
	Customer relationships		9 - 20 years	$	45,860	$	-10,899	$	34,961
	Covenants not to compete		1 - 5 years		372		-163		209
	Technology		11 years		5,830		-1,546		4,284
	Other		2 - 10 years		1,627		-1,072		555
					53,689		-13,680		40,009
	Non-Amortizing:
	Trade names and patents				10,084		-		10,084
				$	63,773	$	-13,680	$	50,093
			Estimated
			Useful Lives	30-Sep-13
	Amortizing:			Cost		Accumulated Amortization		Net
	Customer relationships		9 - 20 years	$	35,797	$	-8,393	$	27,404
	Covenants not to compete		1 - 5 years		450		-185		265
	Technology		11 years		5,830		-1,016		4,814
	Other		2 - 7 years		1,126		-794		332
					43,203		-10,388		32,815
	Non-Amortizing:
	Trade names and patents				7,675		-		7,675
				$	50,878	$	-10,388	$	40,490
Schedule of Expected Amortization Expense	'
		Amount
	2015	$	3,438
	2016		3,316
	2017		3,237
	2018		3,212
	2019		3,041
	Thereafter		23,765
		$	40,009

Debt_Table

Debt (Table)	12 Months Ended
	Sep. 30, 2014
Debt [Abstract]	'
Schedule of Debt	'
		2014		2013
	Revolving credit facility, 1.03% as of September 30, 2014	$	78,200	$	16,300
	Sterling revolving credit facility		-		2,501
	Capital lease obligations (1)		1		119
	Total debt and capital lease obligations		78,201		18,920
	Less: Long-term portion of capital lease obligations		-		-16
	Total debt and capital lease obligations included in current liabilities	$	78,201	$	18,904
	(1) The capital lease obligations have varying maturity dates.

Common_Stock_and_StockBased_Aw1

Common Stock and Stock-Based Awards (Tables)	12 Months Ended
	Sep. 30, 2014
Common Stock and Stock-Based Awards [Abstract]	'
Stock Options Activity	'
			2014						2013						2012
					Weighted							Weighted						Weighted
			Number		average				Number			average			Number			average
			of		exercise				of			exercise			of			exercise
			Shares		price				Shares			price			Shares			price
	Outstanding at beginning of year		16,038		$	17.58				22,360		$	17.53			37,385		$	14.73
	Exercised		-4,030			17.84				-6,186			17.43			-14,769			10.44
	Cancelled or expired		-74			17.00				-136			17.00			-256			17.00
	Outstanding at end of year		11,934		$	17.49				16,038		$	17.58			22,360		$	17.53
	Exercisable at end of year		11,934		$	17.49				16,038		$	17.58			22,360		$	17.53
Stock Options, by Exercise Price Range	'
		Outstanding and exercisable options
					Weighted
					average
					remaining		Weighted
					contractual		average
			Number of		life		exercise
	Range of exercise prices		Shares		(in years)		price
	$17.00 - $19.99		10,774		0.8		$	17.00
	$20.00 - $22.60		1,160		1.0		$	22.05
Schedule of Nonvested Share Activity	'
		2014						2013						2012
				Weighted							Weighted						Weighted
		Number		average				Number			average			Number			average
		of		grant date				of			grant date			of			grant date
		Shares		fair value				Shares			fair value			Shares			fair value
	Nonvested at beginning of year	142,244		$	83.13				129,396		$	69.94			105,540		$	61.69
	Granted	76,555			148.10				70,575			145.65			74,848			101.97
	Vested	-47,154			104.72				-44,547			144.52			-48,072			102.09
	Forfeitures	-8,107			110.64				-13,180			80.96			-2,920			63.49
	Nonvested at end of year	163,538		$	132.04				142,244		$	83.13			129,396		$	69.94

Computation_of_Earnings_per_Co

Computation of Earnings per Common Share (Table)	12 Months Ended
	Sep. 30, 2014
Computation Of Earnings Per Common Share [Abstract]	'
Computation Of Earnings Per Common Share	'
		2014				2013				2012
		Basic		Diluted		Basic		Diluted		Basic		Diluted
	Net income	$	71,962	$	71,962	$	62,849	$	62,849	$	53,477	$	53,477
	Weighted average common
	shares outstanding		12,715		12,715		12,675		12,675		12,616		12,616
	Effect of dilutive securities
	Stock options and restricted stock				30				34				31
	Weighted average shares
	outstanding				12,745				12,709				12,647
	Earnings per share	$	5.66	$	5.65	$	4.96	$	4.95	$	4.24	$	4.23
	Anti-dilutive shares excluded from calculation				3				-				-

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Schedule of Income before Income Tax	'
		2014			2013		2012
	Income before taxes
	United States	$	115,545		$	96,915	$	81,482
	Foreign		2,160			3,766		4,458
	Total income before taxes	$	117,705		$	100,681	$	85,940
Schedule of Components of Income Tax Expense (Benefit)	'
		2014			2013		2012
	United States
	Current payable
	Federal	$	36,585		$	30,200	$	25,535
	State		6,875			4,952		4,494
	Deferred
	Federal		1,216			1,652		1,308
	State		302			253		220
	Total U.S. tax expense		44,978			37,057		31,557
	International
	Current payable		1,265			1,275		1,252
	Deferred		-500			-500		-346
	Total foreign tax expense		765			775		906
	Total income tax expense	$	45,743		$	37,832	$	32,463
Schedule of Deferred Tax Assets and Liabilities	'
		2014			2013
	Deferred tax assets:
	Allowance for doubtful accounts	$	1,061		$	866
	Inventories		942			658
	Lease expense		713			544
	Employee benefits		599			334
	Acquisition-related costs		-			444
	Other		416			164
	Total deferred tax assets		3,731			3,010
	Deferred tax liabilities:
	Investments		-1,414			-786
	Property and equipment		-11,808			-8,876
	Prepaid expenses		-299			-227
	Other		-			-115
	Total deferred tax liabilities		-13,521			-10,004
	Net deferred liabilities	$	-9,790		$	-6,994
Schedule of Effective Income Tax Rate Reconciliation	'
		2014		2013		2012
	Taxes computed at statutory rate	35.0%		35.0%		35.0%
	State income taxes (net of federal income tax benefit)	4.0		3.4		3.6
	Foreign	-0.3		-0.9		-1.1
	Other	0.2		0.1		0.3
		38.9%		37.6%		37.8%
Schedule of Unrecognized Tax Benefits	'
		2014			2013		2012
	Unrecognized tax benefits – Beginning of year	$	-		$	-	$	23
	Gross increases related to prior period tax positions		-			-		-
	Gross decreases related to prior period tax positions		-			-		-8
	Gross increases related to current period tax positions		-			-		-
	Settlements		-			-		-15
	Unrecognized tax benefits – End of year	$	-		$	-	$	-

Recovered_Sheet1

Statements of Cash Flows - Supplemental and Noncash Disclosures (Table)	12 Months Ended
	Sep. 30, 2014
Statements of Cash Flows — Supplemental and Noncash Disclosures [Abstract]	'
Schedule Of Supplemental and Noncash Disclosures	'
		2014		2013		2012
	Supplemental Disclosures
	Cash paid for interest	$	1,110	$	620	$	788
	Cash paid for income taxes		45,117		34,045		31,025
	Noncash Investing and Financing Activities
	Issuance of restricted common stock for asset acquisition		-		-		7,158
	Capital lease asset additions and related obligations		-		-		165
	Property and equipment acquisitions financed with accounts payable		364		265		192

Commitments_and_Contingencies_

Commitments and Contingencies (Table)	12 Months Ended
	Sep. 30, 2014
Commitments and Contingencies [Abstract]	'
Contractual Obligation, Fiscal Year Maturity Schedule	'
		Lease Obligations
	Fiscal Year	Operating Leases		Capital Leases
	2015	$	8,515	$	1
	2016		8,218
	2017		7,649
	2018		7,070
	2019		5,976
	Thereafter		16,583
	Total future minimum obligations	$	54,011	$	1

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Table)	12 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income [Abstract]	'
Schedule of Accumulated Other Comprehensive Income	'
		Year Ended September 30,
		2014		2013		2012
	Balance, beginning of period	$	1,918	$	1,542	$	-563
	Foreign currency translation gain (loss) in
	other comprehensive income		-293		237		1,877
	Actuarial (loss) gain on unfunded pension liability
	net of tax of $(207),  $48, and $145, respectively		-318		139		228
	Balance, end of period	$	1,307	$	1,918	$	1,542

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Sep. 30, 2014
Employee Benefit Plans [Abstract]	'
Schedule of Net Funded Status	'
		2014			2013			2012
	Fair value of plan assets	$	5,732		$	5,242		$	5,329
	Benefit obligation		-7,574			-6,667			-7,228
	Unfunded pension liability	$	-1,842		$	-1,425		$	-1,899
Schedule of Net Benefit Costs	'
		2014			2013			2012
	Interest cost	$	234		$	195		$	219
	Expected return on plan assets		-322			-252			-249
	Net periodic cost		-88			-57			-30
	Other changes recognized in other comprehensive income
	Actuarial loss (gain)		666			-187			-373
	Total recognized in net periodic benefit costs and
	other comprehensive income	$	578		$	-244		$	-403
	Total loss (gain) recognized in other comprehensive income, net of tax	$	318		$	-139		$	-228
Schedule of Weighted-Average Actuarial Assumptions	'
			2014		2013
	Assumptions used to determine benefit obligations
	Discount rate		3.1%		3.6%
	Rate of compensation increase (1)		N/A		N/A
			2014		2013		2012
	Assumptions used to determine net periodic benefit cost
	Discount rate		3.6%		3.0%		3.1%
	Expected return on plan assets		6.0%		5.0%		5.2%
	Rate of compensation increase (1)		N/A		N/A		N/A
	(1) There is no assumed rate of compensation increase as there have been no current active members since April 2006.
Schedule of Allocation of Plan Assets	'
			2014							2013
			Market			Asset		Fair Value		Market		Asset	Fair Value
	Asset Class		Value			Allocation		Level		Value		Allocation	Level
	Equities		$	2,418		42%		2		$	2,062	39%	2
	Corporate bonds			822		14%		2			979	19%	2
	Cash			152		3%		1			82	2%	1
	Other assets			2,340		41%		2			2,119	40%	2
	Total		$	5,732		100%				$	5,242	100%

Geographic_Information_Table

Geographic Information (Table)	12 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Revenues and Long-Lived Assets by Geographic Region	'
		2014		2013		2012
	Revenues for the fiscal years ended September 30
	United States	$	2,651,818	$	2,032,260	$	1,776,414
	International		329,220		315,225		298,732
	Total	$	2,981,038	$	2,347,485	$	2,075,146
	Long-lived assets as of September 30
	United States	$	40,306	$	32,881	$	29,001
	International		9,844		6,302		6,783
	Total	$	50,150	$	39,183	$	35,784

Quarterly_Financial_Data_Table

Quarterly Financial Data (Table)	12 Months Ended
	Sep. 30, 2014
Quarterly Financial Data [Abstract]	'
Schedule of Quarterly Financial Information	'
		Three-Months Ended
		Dec. 31,		Mar. 31,		June 30,		Sept. 30,		Year (1)
			(Dollars and shares in thousands, except per share data)
	Fiscal Year 2014
	Total revenues	$	687,259	$	721,272	$	778,448	$	794,059	$	2,981,038
	Gross profit		89,088		91,060		97,475		93,690		371,313
	Operating income		30,206		27,431		31,329		28,793		117,760
	Net income		18,439		16,776		19,365		17,382		71,962
	Earnings per common share — basic	$	1.45	$	1.32	$	1.52	$	1.37	$	5.66
	Earnings per common share — diluted	$	1.45	$	1.32	$	1.52	$	1.36	$	5.65
	Weighted average common shares
	outstanding:
	Basic		12,707		12,712		12,718		12,722		12,715
	Diluted		12,743		12,748		12,744		12,747		12,745
	Fiscal Year 2013
	Total revenues	$	572,848	$	563,114	$	606,443	$	605,080	$	2,347,485
	Gross profit		76,929		74,679		77,511		75,219		304,338
	Operating income		27,077		24,238		26,534		22,473		100,323
	Net income		16,751		15,100		16,781		14,217		62,849
	Earnings per common share — basic	$	1.32	$	1.19	$	1.32	$	1.12	$	4.96
	Earnings per common share — diluted	$	1.32	$	1.19	$	1.32	$	1.12	$	4.95
	Weighted average common shares
	outstanding:
	Basic		12,665		12,674		12,679		12,683		12,675
	Diluted		12,695		12,709		12,713		12,721		12,709
	(1) The sums of the quarterly amounts may not agree to the year-to-date amount as a result of rounding.

Business_Description_and_Basis1

Business Description and Basis of Presentation (Details)	12 Months Ended
	Sep. 30, 2014
	store
UNITED STATES	'
Business Description And Basis Of Presentation Details [Line Items]	'
Number Of Distribution Centers	23
UNITED KINGDOM	'
Business Description And Basis Of Presentation Details [Line Items]	'
Number Of Distribution Centers	1

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Segment Information) (Details)	12 Months Ended
	Sep. 30, 2014
	segment
Summary of Significant Accounting Policies [Abstract]	'
Number of Reportable Segments	1
Number of Operating Segments	2

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Other Comprehensive Income) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Summary of Significant Accounting Policies [Abstract]	'
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	($385)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$1,692

Summary_of_Significant_Account5

Summary of Significant Accounting Policies (Revenue Recognition) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Summary of Significant Accounting Policies [Abstract]	'	'	'
Gross Billings From Agency Contracts	$355,773	$349,006	$332,343
Contracts Revenue	$20,514	$18,851	$16,979

Summary_of_Significant_Account6

Summary of Significant Accounting Policies (Property and Equipment) (Details)	12 Months Ended
	Sep. 30, 2014
Minimum [Member] | Buildings [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'25 years
Minimum [Member] | Machinery, Furniture, and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'3 years
Minimum [Member] | Computer Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'3 years
Minimum [Member] | Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'1 year
Maximum [Member] | Buildings [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'35 years
Maximum [Member] | Machinery, Furniture, and Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'15 years
Maximum [Member] | Computer Equipment [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'7 years
Maximum [Member] | Leasehold Improvements [Member]	'
Property, Plant and Equipment [Line Items]	'
Property, Plant and Equipment, Useful Life	'10 years

Summary_of_Significant_Account7

Summary of Significant Accounting Policies (Goodwill and Intangible Assets / Other Assets) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified			Minimum [Member]	Maximum [Member]
Intangible Assets [Line Items]	'	'	'	'
Finite-Lived Intangible Assets, Useful Life	'	'	'1 year	'20 years
Cost Method Investments	$5,989	$4,932	'	'

Summary_of_Significant_Account8

Summary of Significant Accounting Policies (Concentrations of Risk) (Details) (Accounts Receivable [Member], Geographic Concentration Risk [Member])	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Accounts Receivable [Member] | Geographic Concentration Risk [Member]	'	'
Concentration Risk [Line Items]	'	'
Customer Concentration Risk	12.30%	14.50%

Summary_of_Significant_Account9

Summary of Significant Accounting Policies (Advertising) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Summary of Significant Accounting Policies [Abstract]	'	'	'
Advertising Expense	$1,481	$1,165	$1,203

Acquisitions_Details

Acquisitions (Details) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Nov. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
	Micro Beef Technologies [Member]	Micro Beef Technologies [Member]	Prescription Containers, Inc. [Member]	IVESCO Holdings, L.L.C. [Member]	IVESCO Holdings, L.L.C. [Member]	VetSpace [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]
							Micro Beef Technologies [Member]	VetSpace [Member]	Micro Beef Technologies [Member]	VetSpace [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Business Acquisition, Date of Acquisition Agreement	31-Oct-11	'	31-Dec-12	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Purchase Price	'	$60,878	$17,107	$79,633	'	$25,013	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Cash Paid	'	53,400	'	'	'	'	'	'	'	'
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred	'	320	'	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Transaction Costs	'	1,104	'	'	'	'	'	'	'	'
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	'	94,359	'	'	'	'	'	'	'	'
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable	'	$7,158	'	'	'	'	'	'	'	'
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'	'	'10 years	'	'9 years	'	'5 years	'10 years	'17 years	'20 years
Business Acquisition, Goodwill, Expected Tax Deductible, Period	'15 years	'	'15 years	'	'15 years	'	'	'	'	'

Acquisitions_Schedule_of_Recog

Acquisitions (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'	'	'
Goodwill	$86,881	$71,150	$61,841
Nelson Laboratories [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Cash	'	'	1
Receivables	'	'	22,374
Inventories	'	'	27,701
Other current assets	'	'	105
Property and equipment	'	'	8,882
Investments	'	'	199
Goodwill	'	'	12,473
Intangibles	'	'	15,760
Total assets acquired	'	'	87,495
Accounts payable	'	'	25,026
Accrued expenses	'	'	1,591
Total liabilities assumed	'	'	26,617
Net assets acquired	'	'	60,878
Micro Beef Technologies [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Receivables	'	3,585	'
Inventories	'	1,928	'
Goodwill	'	9,327	'
Intangibles	'	4,780	'
Total assets acquired	'	19,620	'
Accounts payable	'	2,513	'
Total liabilities assumed	'	2,513	'
Net assets acquired	'	17,107	'
Prescription Containers, Inc. [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Cash	2,549	'	'
Receivables	78,993	'	'
Inventories	65,098	'	'
Other current assets	491	'	'
Property and equipment	7,693	'	'
Investments	1,103	'	'
Goodwill	16,053	'	'
Intangibles	13,021	'	'
Total assets acquired	185,001	'	'
Accounts payable	74,863	'	'
Accrued expenses	3,658	'	'
Other liabilities	1,834	'	'
Total liabilities assumed	80,355	'	'
Net assets acquired	$104,646	'	'

Acquisitions_Information_Inclu

Acquisitions (Information Included in Statements of Income) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012
Business Acquisitions [Abstract]	'
Business Acquisition, Revenue	$246,624
Business Acquisition, Net Income (Loss)	$4,089

Acquisitions_Business_Acquisit

Acquisitions (Business Acquisition Pro Forma Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Business Acquisitions [Abstract]	'	'	'
Business Acquisition, Pro Forma Revenue	$3,031,030	$2,849,712	$2,586,351
Business Acquisition, Pro Forma Net Income (Loss)	$71,963	$66,521	$57,143

Receivables_Details

Receivables (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Receivables, gross	$401,936	$309,906
Allowance for doubtful accounts	-2,946	-2,461
Receivables, net	398,990	307,445
Trade Accounts Receivable [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Receivables, gross	358,757	282,923
Vendor Rebates and Programs [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Receivables, gross	$43,179	$26,983

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	$87,266	$69,074	'
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	-37,116	-29,891	'
Property, Plant and Equipment, Net	50,150	39,183	35,784
Depreciation	8,489	6,974	6,210
Land [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	2,023	1,932	'
Building and Leasehold Improvements [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	17,351	14,914	'
Machinery, Furniture, and Equipment [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	44,877	38,032	'
Computer Equipment [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	17,374	9,868	'
Construction in Progress [Member]	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	$5,641	$4,328	'

Goodwill_and_Intangibles_Chang

Goodwill and Intangibles (Changes in the Carrying Value of Goodwill) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangibles [Abstract]	'	'
Goodwill, Beginning Balance	$71,150	$61,841
Acquisition activity	16,053	9,327
Foreign exchange	-322	-18
Goodwill, Ending Balance	$86,881	$71,150

Goodwill_and_Intangibles_Sched

Goodwill and Intangibles (Schedule Of Intangible Assets) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Gross	$53,689	$43,203
Accumulated Amortization	-13,680	-10,388
Finite-Lived Intangible Assets, Net, Total	40,009	32,815
Indefinite-Lived Intangible Assets (Excluding Goodwill)	10,084	7,675
Intangible Assets, Net	50,093	40,490
Intangible Assets, Gross (Excluding Goodwill)	63,773	50,878
Customer Relationships [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Gross	45,860	35,797
Accumulated Amortization	-10,899	-8,393
Finite-Lived Intangible Assets, Net, Total	34,961	27,404
Noncompete Agreements [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Gross	372	450
Accumulated Amortization	-163	-185
Finite-Lived Intangible Assets, Net, Total	209	265
Technology [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Gross	5,830	5,830
Accumulated Amortization	-1,546	-1,016
Finite-Lived Intangible Assets, Net, Total	4,284	4,814
Finite-Lived Intangible Assets, Useful Life	'11 years	'11 years
Other Intangible Assets [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Gross	1,627	1,126
Accumulated Amortization	-1,072	-794
Finite-Lived Intangible Assets, Net, Total	$555	$332
Minimum [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'1 year	'
Minimum [Member] | Customer Relationships [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'9 years	'9 years
Minimum [Member] | Noncompete Agreements [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'1 year	'1 year
Minimum [Member] | Other Intangible Assets [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'2 years	'2 years
Maximum [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'20 years	'
Maximum [Member] | Customer Relationships [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'20 years	'20 years
Maximum [Member] | Noncompete Agreements [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'5 years	'5 years
Maximum [Member] | Other Intangible Assets [Member]	'	'
Intangible Assets [Line Items]	'	'
Finite-Lived Intangible Assets, Useful Life	'10 years	'7 years

Goodwill_and_Intangibles_Sched1

Goodwill and Intangibles (Schedule of Expected Amortization Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Goodwill and Intangibles [Abstract]	'	'	'
Year One (2015)	$3,438	'	'
Year Two (2016)	3,316	'	'
Year Three (2017)	3,237	'	'
Year Four (2018)	3,212	'	'
Year Five (2019)	3,041	'	'
Thereafter	23,765	'	'
Finite-Lived Intangible Assets, Net, Total	40,009	32,815	'
Amortization of Intangible Assets	$3,368	$3,064	$2,852

Debt_Narrative_Details

Debt (Narrative) (Details)	12 Months Ended	6 Months Ended	12 Months Ended		12 Months Ended					0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Oct. 02, 2014	Oct. 02, 2014	Oct. 02, 2014
	Bank Of America And Wells Fargo Facilities [Member]	Wells Fargo Facility [Member]	Wells Fargo Facility [Member]	Overdraft Facility [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]
	USD ($)	GBP (£)	GBP (£)	GBP (£)	Bank Of America And Wells Fargo Facilities [Member]	Wells Fargo Facility [Member]	Bank Of America And Wells Fargo Facilities [Member]	Wells Fargo Facility [Member]	Bank Of America And Wells Fargo Facilities [Member]	Minimum [Member]	Maximum [Member]
									USD ($)	Bank Of America And Wells Fargo Facilities [Member]	Bank Of America And Wells Fargo Facilities [Member]
Line of Credit Facility [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Maximum Borrowing Capacity	$200,000,000	£ 20,000,000	£ 20,000,000	£ 10,000,000	'	'	'	'	$230,000,000	'	'
Debt Instrument, Basis Spread on Variable Rate	'	'	'	'	0.95%	0.95%	1.50%	1.50%	'	0.95%	1.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	'	'	'	'	0.15%	0.15%	0.25%	0.25%	'	0.15%	0.25%
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	'	'	'	'	'	'	'	'	45,000,000	'	'
Termination Date	1-Nov-16	'	1-Nov-16	'	'	'	'	'	'	'	'
Line of Credit Facility, Increase (Decrease) in Borrowing Capacity	'	'	7,500,000	'	'	'	'	'	'	'	'
Interest Rate at Period End	1.03%	'	'	'	'	'	'	'	'	'	'
Line of Credit Facility, Covenant Terms, Minimum Tangible Net Worth	'	£ 5,000,000	'	'	'	'	'	'	'	'	'

Debt_Schedule_of_Longterm_Debt

Debt (Schedule of Long-term Debt Instruments) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total debt and capital lease obligations	$78,201	$18,920
Less: Long-term portion of capital lease obligations	'	-16
Total debt and capital lease obligations included in current liabilities	78,201	18,904
Domestic Line of Credit [Member]	'	'
Debt Instrument [Line Items]	'	'
Total debt and capital lease obligations	78,200	16,300
Foreign Line of Credit [Member]	'	'
Debt Instrument [Line Items]	'	'
Total debt and capital lease obligations	'	2,501
Capital Lease Obligations [Member]	'	'
Debt Instrument [Line Items]	'	'
Total debt and capital lease obligations	$1	$119

Common_Stock_and_StockBased_Aw2

Common Stock and Stock-Based Awards (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares of common stock available for issuance	757,588	815,260	'
Award expiration period	'10 years	'	'
Intrinsic value of the shares outstanding and exercisable	$1,562	$2,114	'
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	553	644	1,105
Nonvested Awards, Total Compensation Cost Not yet Recognized	21,319	'	'
Compensation Expense	5,033	3,553	'
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	7,020	6,438	4,908
Share purchase price as a percentage of share market value	95.00%	'	'
Employee Stock Purchase Plan Payroll Deduction Rate Minimum	1.00%	'	'
Employee Stock Purchase Plan Payroll Deduction Rate Maximum	10.00%	'	'
Employee Stock Purchase Plan Annual Limit	$20	'	'
Maximum shares per purchase period	200	'	'
Shares issued during the period pursuant to ESPP	5,764	'	5,396
Minimum [Member]	'	'	'
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'1 year	'	'
Maximum [Member]	'	'	'
Share-Based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	'5 years	'	'

Common_Stock_and_StockBased_Aw3

Common Stock and Stock-Based Awards (Stock Options Activity) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Common Stock and Stock-Based Awards [Abstract]	'	'	'
Outstanding at beginning of year	16,038	22,360	37,385
Exercised	-4,030	-6,186	-14,769
Cancelled or expired	-74	-136	-256
Outstanding at end of year	11,934	16,038	22,360
Exercisable at end of year	11,934	16,038	22,360
Weighted average exercise price, Outstanding at beginning of year	$17.58	$17.53	$14.73
Weighted average exercise price, Exercised	$17.84	$17.43	$10.44
Weighted average exercise price, Cancelled or expired	$17	$17	$17
Weighted average exercise price, Outstanding at end of year	$17.49	$17.58	$17.53
Weighted average exercise price, Exercisable	$17.49	$17.58	$17.53

Common_Stock_and_StockBased_Aw4

Common Stock and Stock-Based Awards (Stock Options, by Exercise Price Range) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Sep. 30, 2014
				$17.00 to $19.99	$20.00 to $22.60
Common Stock Outstanding [Line Items]	'	'	'	'	'
Shares Exercisable, End of Year	11,934	16,038	22,360	10,774	1,160
Weighted Average Remaining Contractual Life (in years)	'	'	'	'9 months 18 days	'1 year
Weighted Average Exercise Price	$17.49	$17.58	$17.53	$17	$22.05
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	'	'	'	$17	$20
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	'	'	'	$19.99	$22.60

Common_Stock_and_StockBased_Aw5

Common Stock and Stock-Based Awards (Schedule of Nonvested Share Activity) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Common Stock and Stock-Based Awards [Abstract]	'	'	'
Nonvested at beginning of year	142,244	129,396	105,540
Granted	76,555	70,575	74,848
Vested	-47,154	-44,547	-48,072
Forfeitures	-8,107	-13,180	-2,920
Nonvested at end of year	163,538	142,244	129,396
Weighted average grant date fair value, Nonvested at beginning of year	$83.13	$69.94	$61.69
Weighted average grant date fair value, Granted	$148.10	$145.65	$101.97
Weighted average grant date fair value, Vested	$104.72	$144.52	$102.09
Weighted average grant date fair value, Forfeitures	$110.64	$80.96	$63.49
Weighted average grant date fair value, Nonvested at end of year	$132.04	$83.13	$69.94

Earnings_Per_Common_Share_Deta

Earnings Per Common Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Computation Of Earnings Per Common Share [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income	$17,382	$19,365	$16,776	$18,439	$14,217	$16,781	$15,100	$16,751	$71,962	$62,849	$53,477
Weighted Average Number of Shares Outstanding, Basic	12,722	12,718	12,712	12,707	12,683	12,679	12,674	12,665	12,715	12,675	12,616
Weighted Average Number Diluted Shares Outstanding Adjustment	'	'	'	'	'	'	'	'	30	34	31
Weighted Average Number of Shares Outstanding, Diluted, Total	12,747	12,744	12,748	12,743	12,721	12,713	12,709	12,695	12,745	12,709	12,647
Basic EPS	$1.37	$1.52	$1.32	$1.45	$1.12	$1.32	$1.19	$1.32	$5.66	$4.96	$4.24
Diluted EPS	$1.36	$1.52	$1.32	$1.45	$1.12	$1.32	$1.19	$1.32	$5.65	$4.95	$4.23
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	'	'	'	'	'	'	'	3	'	'

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Income Tax Contingency [Line Items]	'	'
Undistributed Earnings of Foreign Subsidiaries	$2,192	'
Foreign Tax Authority [Member]	'	'
Income Tax Contingency [Line Items]	'	'
Deferred Tax Assets, Gross, Noncurrent	$760	$711

Income_Taxes_Schedule_of_Incom

Income Taxes (Schedule of Income before Income Tax) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]	'	'	'
United States	$115,545	$96,915	$81,482
Foreign	2,160	3,766	4,458
Income before taxes	$117,705	$100,681	$85,940

Income_Taxes_Schedule_of_Compo

Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]	'	'	'
Current Federal Tax Expense (Benefit)	$36,585	$30,200	$25,535
Current State and Local Tax Expense (Benefit)	6,875	4,952	4,494
Deferred Federal Income Tax Expense (Benefit)	1,216	1,652	1,308
Deferred State and Local Income Tax Expense (Benefit)	302	253	220
Federal, State, and Local Income Tax Expense (Benefit), Continuing Operations	44,978	37,057	31,557
Current Foreign Tax Expense (Benefit)	1,265	1,275	1,252
Deferred Foreign Income Tax Expense (Benefit)	-500	-500	-346
Foreign Income Tax Expense (Benefit), Continuing Operations, Total	765	775	906
Total Income Tax Expense (Benefit)	$45,743	$37,832	$32,463

Income_Taxes_Schedule_of_Defer

Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
Components of Deferred Tax Assets [Abstract]	'	'
Allowance for Doubtful Accounts	$1,061	$866
Inventory	942	658
Lease Expense	713	544
Employee Benefits	599	334
Acquisition-related costs	'	444
Other Deferred Tax Assets	416	164
Total Deferred Tax Assets	3,731	3,010
Components of Deferred Tax Liabilities [Abstract]	'	'
Investments	-1,414	-786
Property and Equipment	-11,808	-8,876
Prepaid expenses	-299	-227
Other Deferred Tax Liabilities	'	-115
Total Deferred Tax Liabilities	-13,521	-10,004
Deferred Tax Assets (Liabilities), Net	($9,790)	($6,994)

Income_Taxes_Schedule_of_Effec

Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Abstract]	'	'	'
Taxes computed at statutory rate	35.00%	35.00%	35.00%
State income taxes (net of federal income tax benefit)	4.00%	3.40%	3.60%
Foreign	-0.30%	-0.90%	-1.10%
Other	0.20%	0.10%	0.30%
Effective Income Tax Rate, Total	38.90%	37.60%	37.80%

Income_Taxes_Schedule_of_Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012
Unrecognized Tax Benefits Details [Abstract]	'
Unrecognized Tax Benefits, Beginning of year	$23
Gross increases related to prior period tax positions	'
Gross decreases related to prior period tax positions	-8
Gross increases related to current period tax positions	'
Settlements	-15
Unrecognized Tax Benefits, End of year	'

Statements_of_Cash_Flows_Suppl1

Statements of Cash Flows - Supplemental and Noncash Disclosures (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statements of Cash Flows — Supplemental and Noncash Disclosures [Abstract]	'	'	'
Cash paid for interest	$1,110	$620	$788
Cash paid for income taxes	45,117	34,045	31,025
Issuance of restricted common stock for asset acquisition	'	'	7,158
Capital lease asset additions and related obligations	'	'	165
Property and equipment acquisitions financed with accounts payable	$364	$265	$192

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Commitments and Contingencies [Abstract]	'	'	'
Rent Expense	$8,494	$6,301	$5,382
Loss Contingency, Shares	16,505	'	'
Operating Lease Obligations [Abstract]	'	'	'
Future Minimum Payments (2015)	8,515	'	'
Future Minimum Payments (2016)	8,218	'	'
Future Minimum Payments (2017)	7,649	'	'
Future Minimum Payments (2018)	7,070	'	'
Future Minimum Payments (2019)	5,976	'	'
Future Minimum Payments (Thereafter)	16,583	'	'
Future Minimum Payments, Total	54,011	'	'
Capital Lease Obligations [Abstract]	'	'	'
Future Minimum Payments (2015)	1	'	'
Future Minimum Payments Due, Total	$1	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income [Abstract]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$1,918	$1,542	($563)
Foreign currency translation gain (loss) in other comprehensive income	-293	237	1,877
Actuarial (loss) gain on unfunded pension liability net of tax of $(207), $48, and $145, respectively	-318	139	228
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	1,307	1,918	1,542
Actuarial gain on unfunded pension liability, tax (benefit) provision	($207)	$48	$145

Related_Party_Details

Related Party (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]	'	'	'
Product sales to related party	$68,501	$68,355	$61,873
Feeders Advantage [Member]	'	'	'
Related Party Transaction [Line Items]	'	'	'
Equity Method Investment Ownership Percentage	50.00%	'	'
Product sales to related party	68,501	68,355	61,873
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	1,097	1,079	1,008
Due to Related Parties, Current	$1,495	$777	'

Benefit_Plans_Narrative_Detail

Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Vesting Period	'5 years	'	'
Minimum [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Discretionary Matching Percentage	0.00%	'	'
Maximum [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Discretionary Matching Percentage	3.00%	'	'
United States Defined Contribution Plans Of US Entity [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Cost Recognized	$2,451	$2,122	$1,871
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%	'	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%	'	'
Defined Contribution Plan, Employer Discretionary Contribution Amount	2,203	1,997	1,847
401k Portion [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Requisite Service Period	'2 years	'	'
Defined Contribution Plan, Minimum Age	'21 years	'	'
Profit Sharing Portion [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Requisite Service Period	'3 months	'	'
Defined Contribution Plan, Minimum Age	'21 years	'	'
Foreign Defined Contribution Plans [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Cost Recognized	$278	$257	$250
Foreign Defined Contribution Plans [Member] | Minimum [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	3.00%	'	'
Foreign Defined Contribution Plans [Member] | Maximum [Member]	'	'	'
Defined Contribution Plan [Line Items]	'	'	'
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%	'	'

Benefit_Plans_Schedule_of_Net_

Benefit Plans (Schedule of Net Funded Status) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified
Employee Benefit Plans [Abstract]	'	'	'
Fair value of plan assets	$5,732	$5,242	$5,329
Benefit obligation	-7,574	-6,667	-7,228
Unfunded pension liability	($1,842)	($1,425)	($1,899)

Benefit_Plans_Schedule_of_Net_1

Benefit Plans (Schedule of Net Benefit Costs) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Employee Benefit Plans [Abstract]	'	'	'
Interest Cost	$234	$195	$219
Expected Return on Plan Assets	-322	-252	-249
Net periodic (benefit)/cost	-88	-57	-30
Other Changes Recognized In Other Comprehensive Income [Abstract]	'	'	'
Actuarial gain	666	-187	-373
Total recognized in net periodic benefit costs and other comprehensive income	578	-244	-403
Total gain recognized in other comprehensive income, net of tax	$318	($139)	($228)

Benefit_Plans_Schedule_of_Weig

Benefit Plans (Schedule of Weighted-Average Actuarial Assumptions) (Details)	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]	'		'		'
Discount Rate	3.10%		3.60%		'
Rate of Compensation Increase	'	[1]	'	[1]	'
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]	'		'		'
Discount Rate, Periodic Benefit Costs	3.60%		3.00%		3.10%
Expected Return on Assets	6.00%		5.00%		5.20%
Net Periodic Benefit Cost, Rate of Compensation Increase	'	[1]	'	[1]	'	[1]
[1]	There is no assumed rate of compensation increase as there have been no current active members since April 2006.

Benefit_Plans_Plan_Assets_Deta

Benefit Plans (Plan Assets) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified				Equities [Member]	Equities [Member]	Corporate Bonds [Member]	Corporate Bonds [Member]	Cash [Member]	Cash [Member]	Other Plan Assets [Member]	Other Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Fair Value of Plan Assets	$5,732	$5,242	$5,329	$2,418	$2,062	$822	$979	$152	$82	$2,340	$2,119
Actual Plan Asset Allocations	100.00%	100.00%	'	42.00%	39.00%	14.00%	19.00%	3.00%	2.00%	41.00%	40.00%
Fair Value Measurement Level	'	'	'	'2	'2	'2	'2	'1	'1	'2	'2

Geographic_Information_Revenue

Geographic Information (Revenues and Long-Lived Assets by Geographic Region) (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$794,059	$778,448	$721,272	$687,259	$605,080	$606,443	$563,114	$572,848	$2,981,038	$2,347,485	$2,075,146
Property, Plant and Equipment, Net	50,150	'	'	'	39,183	'	'	'	50,150	39,183	35,784
UNITED STATES	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	2,651,818	2,032,260	1,776,414
Property, Plant and Equipment, Net	40,306	'	'	'	32,881	'	'	'	40,306	32,881	29,001
International [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenues	'	'	'	'	'	'	'	'	329,220	315,225	298,732
Property, Plant and Equipment, Net	$9,844	'	'	'	$6,302	'	'	'	$9,844	$6,302	$6,783

Quarterly_Financial_Data_Sched

Quarterly Financial Data Schedule of Quarterly Financial Information) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Quarterly Financial Data [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$794,059	$778,448	$721,272	$687,259	$605,080	$606,443	$563,114	$572,848	$2,981,038	$2,347,485	$2,075,146
Gross profit	93,690	97,475	91,060	89,088	75,219	77,511	74,679	76,929	371,313	304,338	266,916
Operating Income Loss	28,793	31,329	27,431	30,206	22,473	26,534	24,238	27,077	117,760	100,323	85,767
Net income	$17,382	$19,365	$16,776	$18,439	$14,217	$16,781	$15,100	$16,751	$71,962	$62,849	$53,477
Basic EPS	$1.37	$1.52	$1.32	$1.45	$1.12	$1.32	$1.19	$1.32	$5.66	$4.96	$4.24
Diluted EPS	$1.36	$1.52	$1.32	$1.45	$1.12	$1.32	$1.19	$1.32	$5.65	$4.95	$4.23
Weighted average common shares outstanding:	'	'	'	'	'	'	'	'	'	'	'
Weighted Average Number of Shares Outstanding, Basic	12,722	12,718	12,712	12,707	12,683	12,679	12,674	12,665	12,715	12,675	12,616
Weighted Average Number of Shares Outstanding, Diluted	12,747	12,744	12,748	12,743	12,721	12,713	12,709	12,695	12,745	12,709	12,647