Patterson Companies (PDCO) 10-K 25 Jun 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Apr. 26, 2014	Jun. 19, 2014	Oct. 26, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	26-Apr-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'PDCO	'	'
Entity Registrant Name	'PATTERSON COMPANIES, INC.	'	'
Entity Central Index Key	'0000891024	'	'
Current Fiscal Year End Date	'--04-26	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	103,927,562	'
Entity Public Float	'	'	$4,317,000,000

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$264,908	$505,228
Short-term investments	40,775	'
Receivables, net of allowance for doubtful accounts of $9,873 and $5,808 at April 26, 2014 and April 27, 2013, respectively	607,580	448,158
Inventory	436,463	360,563
Prepaid expenses and other current assets	65,991	47,387
Total current assets	1,415,717	1,361,336
Property and equipment, net	204,939	192,020
Long-term receivables, net	90,535	85,427
Goodwill	844,433	823,740
Identifiable intangibles, net	223,150	196,656
Other	85,903	22,599
Total assets	2,864,677	2,681,778
Current liabilities:	'	'
Accounts payable	342,056	249,795
Accrued payroll expense	66,567	70,687
Other accrued expense	134,840	128,037
Total current liabilities	543,463	448,519
Long-term debt	725,000	725,000
Deferred income taxes	94,004	93,329
Other	30,546	20,475
Total liabilities	1,393,013	1,287,323
Stockholders' equity:	'	'
Common Stock, $.01 par value: Authorized shares - 600,000 Issued and outstanding shares - 103,965 and 105,570 at April 26, 2014, and April 27, 2013, respectively	1,040	1,056
Additional paid-in capital	'	'
Accumulated other comprehensive income	25,370	25,165
Retained earnings	1,531,198	1,463,358
Unearned ESOP shares	-85,944	-95,124
Total stockholders' equity	1,471,664	1,394,455
Total liabilities and stockholders' equity	$2,864,677	$2,681,778

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, except Per Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Receivables, allowance for doubtful accounts	$9,873	$5,808
Common stock, par value	$0.01	$0.01
Common stock, authorized shares	600,000	600,000
Common stock, issued shares	103,965	105,570
Common stock, outstanding shares	103,965	105,570

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Statement [Abstract]	'	'	'
Net sales	$4,063,715	$3,637,212	$3,535,661
Cost of sales	2,865,437	2,446,443	2,373,147
Gross profit	1,198,278	1,190,769	1,162,514
Operating expenses	852,522	836,314	804,505
Operating income	345,756	354,455	358,009
Other income and expense:	'	'	'
Other income, net	2,869	3,059	2,146
Interest expense	-35,713	-36,397	-30,343
Income before taxes	312,912	321,117	329,812
Income taxes	112,300	110,845	116,997
Net income	200,612	210,272	212,815
Earnings per share:	'	'	'
Basic	$1.99	$2.04	$1.93
Diluted	$1.97	$2.03	$1.92
Shares:	'	'	'
Basic	100,727	103,030	110,121
Diluted	101,643	103,807	110,846
Dividends declared per common share	$0.68	$0.58	$0.50
Comprehensive income	'	'	'
Net income	200,612	210,272	212,815
Foreign currency translation (loss) gain	6,059	-7,132	-9,372
Cash flow hedge	-5,854	-158	-123
Comprehensive income	$200,817	$202,982	$203,320

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Retained Earnings [Member]	Unearned ESOP Shares [Member]
In Thousands, except Share data
Balance at Apr. 30, 2011	$1,560,540	$1,211	'	$41,950	$1,632,497	($115,118)
Balance, Shares at Apr. 30, 2011	'	121,099,850	'	'	'	'
Foreign currency translation	-9,372	'	'	-9,372	'	'
Cash flow hedge	-123	'	'	-123	'	'
Net income	212,815	'	'	'	212,815	'
Dividends declared	-55,319	'	'	'	-55,319	'
Common stock issued and related tax benefits (in shares)	'	778,856	'	'	'	'
Common stock issued and related tax benefits	14,560	8	14,552	'	'	'
Repurchase of common stock (in shares)	'	-11,954,257	'	'	'	'
Repurchase of common stock	-361,047	-120	-27,167	'	-333,760	'
Stock-based compensation	12,615	'	12,615	'	'	'
ESOP activity	533	'	'	'	'	533
Balance at Apr. 28, 2012	1,375,202	1,099	'	32,455	1,456,233	-114,585
Balance, Share at Apr. 28, 2012	'	109,924,449	'	'	'	'
Foreign currency translation	-7,132	'	'	-7,132	'	'
Cash flow hedge	-158	'	'	-158	'	'
Net income	210,272	'	'	'	210,272	'
Dividends declared	-57,384	'	'	'	-57,384	'
Common stock issued and related tax benefits (in shares)	'	869,580	'	'	'	'
Common stock issued and related tax benefits	21,325	9	21,316	'	'	'
Repurchase of common stock (in shares)	'	-5,224,017	'	'	'	'
Repurchase of common stock	-181,756	-52	-35,941	'	-145,763	'
Stock-based compensation	14,625	'	14,625	'	'	'
ESOP activity	19,461	'	'	'	'	19,461
Balance at Apr. 27, 2013	1,394,455	1,056	'	25,165	1,463,358	-95,124
Balance, Share at Apr. 27, 2013	105,570,000	105,570,012	'	'	'	'
Foreign currency translation	6,059	'	'	6,059	'	'
Cash flow hedge	-5,854	'	'	-5,854	'	'
Net income	200,612	'	'	'	200,612	'
Dividends declared	-72,413	'	'	'	-72,413	'
Common stock issued and related tax benefits (in shares)	'	748,874	'	'	'	'
Common stock issued and related tax benefits	27,468	7	27,461	'	'	'
Repurchase of common stock (in shares)	'	-2,354,000	'	'	'	'
Repurchase of common stock	-96,486	-23	-36,104	'	-60,359	'
Stock-based compensation	8,643	'	8,643	'	'	'
ESOP activity	9,180	'	'	'	'	9,180
Balance at Apr. 26, 2014	$1,471,664	$1,040	'	$25,370	$1,531,198	($85,944)
Balance, Share at Apr. 26, 2014	103,965,000	103,964,886	'	'	'	'

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Operating activities:	'	'	'
Net income	$200,612	$210,272	$212,815
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation	27,113	25,720	25,254
Amortization	22,873	20,282	16,955
Bad debt expense	3,220	1,119	2,445
Non-cash employee compensation	20,018	35,202	13,371
Excess tax benefits from stock-based compensation	-1,290	-2,487	-1,371
Non-cash charges related to medical divestitures	13,842	'	'
Deferred income taxes	7,765	7,049	89
Change in assets and liabilities net of acquired:	'	'	'
Decrease (increase) in receivables	-50,756	17,226	468
Decrease (increase) in inventory	-36,019	-39,096	16,859
(Decrease) increase in accounts payable	12,345	41,347	-6,847
(Decrease) increase in accrued liabilities	14,125	-21,767	37,948
Decrease (increase) in long-term receivables	-5,108	27	-1,766
Other changes from operating activities, net	-32,904	4,301	4,938
Net cash provided by operating activities	195,836	299,195	321,158
Investing activities:	'	'	'
Additions to property and equipment, net of acquisitions	-40,387	-21,983	-29,650
Acquisitions and equity investments, net of cash	-145,815	-14,650	-22,620
Proceeds from sale	6,546	'	'
Purchase of investment	-99,672	'	'
Other investing activities	-4,436	6,595	'
Net cash used in investing activities	-283,764	-30,038	-52,270
Financing activities:	'	'	'
Dividends paid	-85,657	-43,767	-54,741
Repurchases of common stock	-96,486	-179,525	-362,379
ESOP activity	435	1,576	931
Common stock issued, net	20,217	13,131	13,621
Retirement of long term debt	'	-125,000	'
Debt issuance cost	'	'	-1,862
Payment to revolver	-135,000	'	-20,000
Draw on revolver	135,000	'	20,000
Proceeds from issuance of long-term debt	'	'	325,000
Excess tax benefits from stock-based compensation	1,290	2,487	1,371
Net cash used in financing activities	-160,201	-331,098	-78,059
Effect of exchange rate changes on cash	7,809	-6,612	-5,713
Net (decrease) increase in cash and cash equivalents	-240,320	-68,553	185,116
Cash and cash equivalents at beginning of period	505,228	573,781	388,665
Cash and cash equivalents at end of period	264,908	505,228	573,781
Supplemental disclosures:	'	'	'
Income taxes paid	108,374	124,146	81,959
Interest paid	34,933	35,965	24,868
Repurchases of common stock with liability due to broker	'	$2,707	$475

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Apr. 26, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1. Summary of Significant Accounting Policies
	Description of Business
	Patterson Companies, Inc., (referred to herein as “Patterson” or in the first person notations “we,” “our,” and “us”) is a value-added distributor serving the North American dental supply, U.S. and U.K. veterinarian supply and the worldwide rehabilitation and assistive products supply market. Patterson Companies has three reportable segments: dental supply, veterinary supply and rehabilitation supply.
	Basis of Presentation
	The consolidated financial statements include the accounts of our wholly owned subsidiaries. Intercompany transactions and balances have been eliminated in consolidation. The respective assets of PDC Funding Company, LLC and PDC Funding Company II, LLC, would be available first and foremost to satisfy the claims of their respective creditors. There are no known creditors of PDC Funding Company, LLC or PDC Funding Company II, LLC.
	Fiscal Year End
	We utilize a fifty-two, fifty-three week fiscal year ending on the last Saturday in April. Accordingly, fiscal years 2014, 2013 and 2012 included fifty-two weeks.
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Cash and Cash Equivalents
	Cash equivalents consist primarily of investments in money market funds and government securities. The maturity of these securities at the time of purchase is 90 days or less. All cash and cash equivalents are classified as available-for-sale and carried at fair value, which approximates cost.
	Inventory
	Inventory consists of merchandise held for sale and is stated at the lower of cost or market. Cost is determined using the last-in, first-out (LIFO) method for all inventories, except for foreign inventories and manufactured inventories, which are valued using the first-in, first-out (FIFO) method. Inventories valued at LIFO represent 75% and 83% of total inventories at April 26, 2014 and April 27, 2013, respectively.
	The accumulated LIFO reserve was $74,607 at April 26, 2014 and $70,415 at April 27, 2013. We believe that inventory replacement cost exceeds the inventory balance by an amount approximating the LIFO reserve.
	Property and Equipment
	Property and equipment are stated at cost. Depreciation is calculated on the straight-line method over estimated useful lives of up to 39 years for buildings or the expected remaining life of purchased buildings, the term of the lease for leasehold improvements, 3 years for laptops, 5 years for data processing equipment, and 5 to 10 years for office furniture and equipment.
	Goodwill and Other Indefinite-Lived Intangible Assets
	Goodwill represents the excess of cost over the fair value of identifiable net assets of businesses acquired. We have three reporting units as of April 26, 2014, which are the same as our reportable segments. Other indefinite-lived intangible assets include copyrights, trade names and trademarks.
	We evaluate goodwill at least annually using a qualitative assessment to determine whether it is more likely than not that the fair value of any reporting unit is less than its carrying amount. If we determine that the fair value of the reporting unit may be less than its carrying amount, we evaluate goodwill using a two-step impairment test. Otherwise, we conclude that no impairment is indicated and we do not perform the two-step impairment test.
	The first step of the goodwill impairment test compares the book value of a reporting unit, including goodwill, with its fair value, as determined primarily by its discounted cash flows. If the book value of a reporting unit exceeds its fair value, the second step of the impairment test is performed to determine the amount of goodwill impairment loss to be recorded. The determination of fair value involves uncertainties because it requires management to make assumptions and to apply judgment to estimate industry and economic factors and the profitability of future business strategies. Patterson conducts impairment testing based on current business strategy in light of present industry and economic conditions, as well as future expectations. Additionally, in assessing goodwill for impairment, the reasonableness of the implied control premium is considered based on market capitalizations and recent market transactions.
	Other indefinite-lived intangible assets are assessed for impairment by comparing the carrying value of an asset with its fair value. If the carrying value exceeds fair value, an impairment loss is recognized in an amount equal to the excess. The determination of fair value involves assumptions, including projected revenues and gross profit levels, as well as consideration of any factors that may indicate potential impairment.
	In the fourth quarter of fiscal 2014, management completed its annual goodwill and other indefinite-lived intangible asset impairment tests and determined there was no impairment. Although we believe estimates and assumptions used in estimating cash flows and determining fair value are reasonable, making material changes to such estimates and assumptions could materially affect such impairment analyses and financial results, including an impairment charge that could be material.
	The medical reporting unit was evaluated using a quantitative assessment for impairment testing. This reporting unit has a higher level of sensitivity to impairment as management currently assesses the various estimates and assumptions used to conduct these tests. A significant reduction in these assumptions from further softening in medical utilizations in the U.S. or more severe austerity measures in the United Kingdom could cause us to recognize a material impairment charge on this reporting unit. At April 26, 2014, the estimated fair value of this reporting unit exceeded its book value by approximately 6%.
	Long-Lived Assets
	Long-lived assets, including definite-lived intangible assets, are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable through the estimated undiscounted future cash flows derived from such assets. Our definite-lived intangible assets primarily consist of an exclusive distribution agreement and customer lists. When impairment exists, the related assets are written down to fair value. No impairment was recognized in the periods presented.
	Financial Instruments
	We account for derivative financial instruments under the provisions of Accounting Standard Codification Topic 815, “Derivatives and Hedging.” Our use of derivative financial instruments is generally limited to managing well-defined interest rate risks. Patterson does not use financial instruments or derivatives for any trading purposes.
	Revenue Recognition
	Revenues are generated from the sale of consumable products, equipment, software products and services, technical service parts and labor, freight and delivery charges, and other sources. Revenues are recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and there is reasonable assurance of collection of the sale. Estimates for returns, damaged goods, rebates, loyalty programs and other revenue allowances are made at the time the revenue is recognized based on the historical experience for such items. In addition to revenues generated from the distribution of consumable products under conventional arrangements (buy/sell agreements) where the full market value of the product is recorded as revenue, the veterinary segment may earn a small amount of commission income for services provided under agency agreements with certain pharmaceutical manufacturers. The services generally consist of detailing the product and taking the customer’s order. The agency agreement contrasts to a buy/sell agreement in that the veterinary segment does not purchase and handle the product or bill and collect from the customer in an agency relationship with a vendor.
	Consumable product sales are recorded upon delivery, except in those circumstances where terms of the sale are FOB shipping point. Commissions under agency agreements are recorded when the services are provided.
	Equipment and software product revenues are recognized upon delivery and, if necessary, installation. In those circumstances where terms of the sale are FOB shipping point, revenues are recognized when products are transferred to the shipping carrier. Revenue derived from post contract customer support for software is deferred and recognized ratably over the period in which the support is provided. Patterson provides financing for select equipment and software sales. Revenue is recorded at the present value of the finance contract, with discount, if any, and interest income recognized over the life of the finance contract as “other income”. See Note 6 to the Consolidated Financial Statements, for more information regarding customer financing.
	Other revenue, including freight and delivery charges and technical service parts and labor, is recognized when the related product revenue is recognized or when the product or services are provided to the customer.
	The receivables that result from the recognition of revenue are reported net of the related allowances discussed above. Patterson maintains a valuation allowance based upon the expected collectability of receivables held. Estimates are used to determine the valuation allowance and are based on several factors, including historical collection data, economic trends and credit worthiness of customers. Receivables are written off when we determine the amounts to be uncollectible, typically upon customer bankruptcy or non-response to continuous collection efforts. The portions of receivable amounts that are not expected to be collected during the next twelve months are classified as long-term.
	Patterson has a relatively large, dispersed customer base and no single customer accounts for more than 2% of consolidated net sales. In addition, the equipment sold to customers under finance contracts generally serves as collateral for the contract and the customer provides a personal guarantee as well.
	Patterson Advantage Loyalty Program
	The Dental segment provides a point-based awards program to qualifying customers involving the issuance of “Patterson Advantage dollars” which can be used toward equipment and technology purchases. The program was initiated on January 1, 2009 and runs on a calendar year schedule. Patterson Advantage dollars earned during a program year expire one year after the end of the program year. The cost and corresponding liability associated with the program are recognized as contra-revenue in accordance with ASC Topic 605-50, “Revenue Recognition-Customer Payments and Incentives.” As of April 26, 2014, we believe we have sufficient experience with the program to reasonably estimate the amount of Patterson Advantage dollars that will not be redeemed and thus have recorded a liability for 87% of the maximum potential amount that could be redeemed. We use the redemption recognition method and we recognize the estimated value of unused Advantage dollars as a percentage of Patterson Advantage dollars earned. Breakage recognized was immaterial to all periods presented.
	Freight and Delivery Charges
	Freight and delivery charges are included in “cost of sales”.
	Advertising
	We expense all advertising and promotional costs as incurred, except for direct marketing expenses, which are expensed over the shorter of the life of the asset or one year. Total advertising and promotional expenses were $18,263, $19,721 and $18,811 for fiscal years 2014, 2013, and 2012, respectively. Deferred direct-marketing expenses included in prepaid and other current assets on the consolidated balance sheet as of April 26, 2014, and April 27, 2013 were $2,031 and $1,845, respectively.
	Income Taxes
	The liability method is used to account for income tax expense. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse.
	Valuation allowances are established for deferred tax assets if, after assessment of available positive and negative evidence, it is more likely than not that the deferred tax asset will not be fully realized.
	Employee Stock Ownership Plan (ESOP)
	Compensation expense related to our defined contribution ESOP is computed based on the shares allocated method.
	Self-insurance
	Patterson is self-insured for certain losses related to general liability, product liability, automobile, workers’ compensation and medical claims. We estimate our liabilities based upon an analysis of historical data and actuarial estimates. While current estimates are believed reasonable based on information currently available, actual results could differ and affect financial results due to changes in the amount or frequency of claims, medical cost inflation or other factors. Historically, actual results related to these types of claims have not varied significantly from estimated amounts.
	Stock-based Compensation
	We recognize stock-based compensation expense based on the grant-date fair value of awards estimated in accordance with ASC Topic 718, “Stock Compensation”.
	Comprehensive Income
	Comprehensive income is computed as net income plus certain other items that are recorded directly to stockholders’ equity. Significant items included in comprehensive income are foreign currency translation adjustments and the effective portion of cash flow hedges. Foreign currency translation adjustments do not include a provision for income tax because earnings from foreign operations are considered to be indefinitely reinvested outside the U.S.
	Earnings Per Share
	The amount of basic earnings per share is computed by dividing net income by the weighted average number of outstanding common shares during the period. The amount of diluted earnings per share is computed by dividing net income by the weighted average number of outstanding common shares and common share equivalents, when dilutive, during the period.
	The following table sets forth the denominator for the computation of basic and diluted earnings per share. There were no material adjustments to the numerator.
		Fiscal Year
		2014		2013		2012
		(in thousands)
	Denominator:
	Denominator for basic earnings per share – weighted average shares		100,727		103,030		110,121
	Effect of dilutive securities – stock options, restricted stock and stock purchase plans		916		777		725
	Denominator for diluted earnings per share – adjusted weighted average shares		101,643		103,807		110,846
	Options to purchase 39, 362 and 520 shares of common stock during fiscal years 2014, 2013 and 2012, respectively, were excluded from the calculation of diluted earnings per share because the effect would have been anti-dilutive. Unvested restricted stock awards outstanding which were excluded from the calculation of diluted earnings per share during fiscal years 2014, 2013 and 2012 were 0, 0 and 140, respectively, because the effect would have been anti-dilutive.
	Recent Accounting Pronouncements
In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers. ASU No. 2014-09 supersedes the revenue recognition requirements in “Revenue Recognition (Topic 605),” and 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. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period and is to be applied retrospectively, with early application not permitted. We are evaluating the new standard, but do not, at this time, anticipate a material impact to the financial statements once implemented.
In February 2013, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Under this standard, entities will be required to disclose additional information with respect to changes in accumulated other comprehensive income (AOCI) balances by component and significant items reclassified out of AOCI. Expanded disclosures for presentation of changes in AOCI involve disaggregating the total change of each component of other comprehensive income as well as presenting separately for each such component the portion of the change in AOCI related to (1) amounts reclassified into income and (2) current-period other comprehensive income. Additionally, for amounts reclassified into income, disclosure in one location would be required, based upon each specific AOCI component, of the amounts impacting individual income statement line items. Disclosure of the income statement line item impacts will be required only for components of AOCI reclassified into income in their entirety. The disclosures required with respect to income statement line item impacts would be made in either the notes to the consolidated financial statements or parenthetically on the face of the financial statements. For Patterson, this ASU was effective beginning January 27, 2013. Because this standard only impacts presentation and disclosure requirements, its adoption did not have a material impact on our consolidated results of operations or financial condition.
In July 2012, the FASB issued ASU No. 2012-02, Testing Indefinite-Lived Intangible Assets for Impairment. Under this standard, entities testing long-lived intangible assets for impairment now have an option of performing a qualitative assessment to determine whether further impairment testing is necessary. If an entity determines, on the basis of qualitative factors, that the fair value of the indefinite-lived intangible asset is more-likely-than-not less than the carrying amount, the existing quantitative impairment test is required. Otherwise, no further impairment testing is required. For Patterson, this ASU was effective beginning April 28, 2013. The adoption of this standard did not have a material impact on Patterson’s consolidated results of operations or financial condition.

Cash_and_cash_equivalents

Cash and cash equivalents	12 Months Ended
	Apr. 26, 2014
Cash And Cash Equivalents [Abstract]	'
Cash and cash equivalents	'
	2. Cash and cash equivalents
	At April 26, 2014 and April 27, 2013, cash and cash equivalents consisted of the following:
		April 26,		April 27,
		2014		2013
	Cash on hand	$	213,397	$	222,609
	Money market funds		51,511		282,619
	Total	$	264,908	$	505,228
	Cash on hand is generally in interest earning accounts.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Apr. 26, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	3. Goodwill and Other Intangible Assets
	The changes in the carrying value of goodwill for each of our reportable segments for the fiscal year ended April 26, 2014 are as follows:
		Balance at			Acquisition			Other			Balance at
		April 27, 2013			Activity			Activity			April 26, 2014
	Dental supply	$	137,867		$	649		$	(1,053	)	$	137,463
	Rehabilitation supply		549,020			—			(4,013	)		545,007
	Veterinary supply		136,853			23,374			1,736			161,963
	Total	$	823,740		$	24,023		$	(3,330	)	$	844,433
	The increase in the acquisition activity column during the twelve-month period ended April 26, 2014 primarily reflects the purchase price allocation for the Dental segment acquisition of Mercer Mastery and the Veterinary segment acquisition of National Veterinary Supply, which were acquired in fiscal 2014. The other activity column is comprised primarily of earn-out payments made related to acquisitions completed prior to the adoption of the guidance in ASC 805, foreign currency translation, and allocations of amounts of goodwill to assets that were sold.
	Other intangible assets acquired in the acquisitions in fiscal 2014 had a fair value of approximately $45.8 and a weighted average useful life of 10 years.
	Balances of other intangible assets excluding goodwill are as follows:
		April 26,			April 27,
		2014			2013
	Unamortized – indefinite lived:
	Copyrights, trade names and trademarks	$	76,464		$	76,464
	Amortized:
	Distribution agreement, customer lists and other		286,365			235,781
	Less: Accumulated amortization		(139,67	)		(115,589	)
	Net amortized intangible assets		146,686			120,192
	Total identifiable intangible assets, net	$	223,150		$	196,656
	In 2006, we extended our exclusive North American distribution agreement with Sirona Dental Systems GmbH (“Sirona”) for Sirona’s CEREC dental restorative system. We paid a $100,000 distribution fee to extend the agreement for a 10-year period that began in October 2007, which is included in identifiable intangibles, net in the consolidated balance sheet. The amortization of the distribution agreement fee is recorded over the 10-year period based on estimates of the pattern in which the economic benefits of the fee are expected to be realized, consisting primarily of revenues generated from the sale of CEREC dental restorative systems. Amortization expense in any year may differ significantly from other years. In early fiscal 2013, we expanded our exclusive distribution relationship with Sirona to add SIRONA imaging products to our exclusive offerings, as well as add mechanisms to adjust the exclusivity term depending on performance. No additional monies were exchanged as part of this expanded relationship. This is not a “take-or-pay” contract.
	With respect to the amortized intangible assets, future amortization expense is expected to approximate $25,315, $26,275 $28,231, $13,391 and $4,128 for fiscal years 2015, 2016, 2017, 2018 and 2019, respectively. The preceding expected amortization expense is an estimate. Actual amounts of amortization expense may differ from estimated amounts due to additional intangible asset acquisitions, actual revenues generated from the sale of CEREC dental restorative systems, changes in foreign currency exchange rates, impairment of intangible assets, accelerated amortization of intangible assets and other events.

Acquisitions_and_Equity_Invest

Acquisitions and Equity Investments	12 Months Ended
	Apr. 26, 2014
Business Combinations [Abstract]	'
Acquisitions and Equity Investments	'
	4. Acquisitions and Equity Investments
	We completed acquisitions during fiscal years 2014, 2013 and 2012. The operating results of each of these acquisitions are included in our consolidated statements of income from the date of each acquisition. Pro forma results of operations and details of the purchase price allocations have not been presented for these acquisitions, with the exception of NVS presented below, as the effects of these business acquisitions were not material either individually or in the aggregate. A listing of acquisitions completed during the periods covered by these financial statements is presented below. We acquired 100% of all companies listed below:
	Entity	Segment
	Fiscal 2014:
	Mercer Mastery	Dental supply
	National Veterinary Supply	Veterinary supply
	Fiscal 2013:
	Iowa Dental Supply	Dental supply
	Universal Vaporizer Support	Veterinary supply
	Fiscal 2012:
	American Veterinarian Supply Corp.	Veterinary supply
	Surgical Synergies Pty Ltd.	Rehabilitation supply
	Orthoplast	Rehabilitation supply
	On August 16, 2013, Patterson Companies, Inc. completed the acquisition of all the outstanding stock of National Veterinary Services Limited (“NVS”) from Dechra Pharmaceuticals, PLC. NVS is the largest veterinary products distributor in the United Kingdom.
	The acquisition was accounted for as a business combination using the acquisition method. We have estimated the acquisition date fair values of the assets acquired and liabilities assumed, using independent appraisals, other analyses and have determined final working capital adjustments. Therefore, an allocation of the purchase price to the acquired assets, liabilities, and goodwill is presented in the table below.
	At August 16, 2013 (in thousands)
	Receivables	$	113,037
	Inventory		45,785
	Prepaid expenses and other current assets		1,187
	Property, plant and equipment		2,622
	Goodwill		23,374
	Identifiable intangibles		45,337
	Accounts payable		(79,916	)
	Others accrued liabilities		(8,733	)
	Purchase price	$	142,693
	Goodwill is calculated as the excess of the purchase price over the fair value of the net assets recognized. The goodwill recorded as part of the acquisition primarily reflects the value of the assembled workforce, cost synergies, and the potential to integrate and expand existing product lines. The goodwill and intangible assets have been allocated to the Veterinary reporting segment.
	We recognized $675 of transaction costs related to the NVS acquisition through fiscal year 2014, and the charges were reported in operating expense in the Condensed Consolidated Statement of Income.
	Operating results for this acquisition have been included in our Condensed Consolidated Statements of Income and Other Comprehensive Income from the date of acquisition (i.e. beginning in the second quarter) and are reflected in the Veterinary reporting segment. The acquisition contributed net sales of $419,340 to the segment during fiscal year 2014. Pro forma results are not presented, as the acquisition is not considered material to our Company.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Apr. 26, 2014
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	5. Property and Equipment
	Property and equipment consisted of the following items:
		April 26,			April 27,
		2014			2013
	Land	$	14,925		$	14,811
	Buildings		129,360			127,364
	Leasehold improvements		18,295			16,751
	Furniture and equipment		152,899			139,261
	Data processing equipment		109,580			98,117
	Construction-in-progress		18,110			5,594
			443,169			401,898
	Accumulated depreciation		(238,230	)		(209,878	)
	Property and equipment, net	$	204,939		$	192,020

Customer_Financing

Customer Financing	12 Months Ended
	Apr. 26, 2014
Text Block [Abstract]	'
Customer Financing	'
	6. Customer Financing
	As a convenience to our customers, we offer several different financing alternatives including both our Company-sponsored program and a third party program. For the third party program, we act as a facilitator between the customer and the third party financing entity with no on-going involvement in the financing transaction. Under our sponsored program, equipment purchased by customers with strong credit may be financed up to a maximum of $500 for any one customer. We generally sell the customers’ financing contracts to outside financial institutions in the normal course of our business. Patterson currently has two arrangements under which we sell these contracts.
	Patterson operates under an agreement to sell a portion of our equipment finance contracts to commercial paper conduits with The Bank of Tokyo-Mitsubishi UFJ, Ltd. serving as the agent. We utilize a special purpose entity (“SPE”), PDC Funding, a consolidated, wholly owned subsidiary to fulfill a requirement of participating in the commercial paper conduit. We receive the proceeds of the contracts upon sale. At least 9% of the proceeds are held by the conduit as security against eventual performance of the portfolio. The amount held by the conduit can be greater than 9% and is based upon certain ratios defined in the agreement. The capacity under the agreement at April 26, 2014 was $500,000.
	Patterson also maintains an agreement with Fifth Third Bank whereby the bank purchases customers’ financing contracts. Patterson has established another SPE, PDC Funding II, as a consolidated, wholly owned subsidiary, which sells financing contracts to the bank. We receive the proceeds of the contracts upon sale. At least 10% of the proceeds are held by the conduit as security against eventual performance of the portfolio. The amount held by the conduit can be greater than 10% and is based upon certain ratios defined in the agreement. The capacity under the agreement at April 26, 2014 was $100,000.
	The portion of the purchase price for the receivables held by the conduits is a deferred purchase price receivable, which is paid to the SPE as payments on the receivables are collected from customers. The deferred purchase price receivable represents a beneficial interest in the transferred financial assets and is recognized at fair value as part of the sale transaction. The Company values the deferred purchase price receivable based on a discounted cash flow analysis using unobservable inputs (i.e. level 3 inputs), which include a forward yield curve, the estimated timing of payments and the credit quality of the underlying creditor. Significant increases in any of the significant unobservable inputs in isolation would not result in a materially lower fair value estimate. The interrelationship between these inputs is insignificant.
	These financing arrangements are accounted for as a sale of assets under the provisions of ASC Topic No. 860, Transfers and Servicing. During fiscal 2014, 2013 and 2012, we sold approximately $282,698, $283,175 and $287,627, respectively, of contracts under these arrangements. Patterson retains servicing responsibilities under both agreements, for which we are paid a servicing fee. The servicing fees received by Patterson are considered adequate compensation for services rendered. Accordingly, no servicing asset or liability has been recorded. The agreements require us to maintain a minimum current ratio and maximum leverage ratio. Patterson was in compliance with the covenants at April 26, 2014.
	Included in cash and cash equivalents in the consolidated balance sheets are approximately $28,152 and $34,260 as of April 26, 2014 and April 27, 2013, respectively, which represents cash collected from previously sold customer financing arrangements that have not yet been settled with the third party. Included in current receivables in the consolidated balance sheets are approximately $63,236, net of unearned income of $5,894, and $64,272, net of unearned income of $1,586, as of April 26, 2014 and April 27, 2013, respectively, of finance contracts not yet sold by Patterson. A total of $496,906 of finance contracts receivable sold under the agreements was outstanding at April 26, 2014. The deferred purchase price under the arrangements was approximately $84,750 and $72,328 as of April 26, 2014 and April 27, 2013, respectively. Since the internal financing program began in 1994, bad debt write-offs have amounted to less than one-percent of the loans originated.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Apr. 26, 2014
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	7. Long-Term Debt
	Expected future minimum principal payments under our debt obligations are as follows: $250,000 in fiscal 2015 (which we have both the intent and ability to refinance at that time, therefore we have classified this balance as long term debt on the balance sheet as of April 26, 2014), $150,000 in fiscal 2018, $60,000 in fiscal 2019 and $265,000 in years thereafter.
	In March 2008, Patterson issued fixed-rate senior notes with an aggregate principal amount of $450,000, consisting of (i) $50,000 4.63% senior notes, paid in fiscal 2013; (ii) $250,000 5.17% senior notes, due fiscal 2015; and (iii) $150,000 5.75% senior notes, due fiscal 2018.
	Also in March 2008, we entered into a term loan agreement with a group of banks in the principal amount of $75,000, which was paid in fiscal 2013. The term loan required interest at a floating rate based on LIBOR plus a spread that ranged from 0.50% to 1.25% based on our leverage ratio, as defined in the agreement.
	In December 2011, we issued fixed-rate senior notes with an aggregate principal amount of $325,000, consisting of (i) $60,000 2.95% senior notes, due fiscal 2019; (ii) $165,000 3.59% senior notes, due fiscal 2022; and (iii) $100,000 3.74% senior notes, due fiscal 2024.
	A portion of the proceeds from the issuance of debt in December 2011 was used to repurchase shares of our common stock and to repay borrowings under our revolving line of credit. The remaining proceeds are intended to be used for general corporate purposes. Debt issuance costs associated with the issuance of debt in March 2008 of $1,800 and in December 2011 of $1,800 are being amortized to interest expense over the life of the related debt.
	In addition, in March 2008 we entered into two forward starting interest rate swap agreements, each with notional amounts of $100,000 and accounted for as cash flow hedges, to hedge interest rate fluctuations in anticipation of the issuance of the 5.17% senior notes due fiscal 2015 and the 5.75% senior notes due fiscal 2018, respectively. Upon issuance of the hedged debt, Patterson settled the forward starting interest rate swap agreements and recorded a $1,000 increase, net of income taxes, to other comprehensive income, which is being amortized against interest expense over the life of the related debt. The pre-tax amount reclassified into earnings during fiscal years 2014, 2013 and 2012 was $200. The amount expected to be reclassified into earnings during fiscal 2015 is also expected to be $200.
	Patterson has available a $300,000 revolving credit facility through December 2016. Interest on borrowings is based on LIBOR plus a spread which can range from 1.125% to 1.875%. This spread as well as a commitment fee on the unused portion of the facility are based on our leverage ratio, as defined in the agreement. There were no outstanding borrowings under the facility at April 26, 2014 or April 27, 2013.
	The debt agreements contain various financial covenants including certain leverage and interest coverage ratios as defined in the agreements. Patterson met the financial and nonfinancial covenants under the debt agreements as of April 26, 2014.
	Patterson’s debt consists of the following:
		April 26, 2014		April 27, 2013
	5.17% senior notes due fiscal 2015	$	250,000	$	250,000
	5.75% senior notes due fiscal 2018		150,000		150,000
	2.95% senior notes due fiscal 2019		60,000		60,000
	3.59% senior notes due fiscal 2022		165,000		165,000
	3.74% senior notes due fiscal 2024		100,000		100,000
	Total debt		725,000		725,000
	Less: current debt obligations		—		—
	Long-term debt	$	725,000	$	725,000

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Apr. 26, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments	'
	8. Derivative Financial Instruments
	Patterson is a party to certain offsetting and identical interest rate cap agreements. These cap agreements are not designated for hedge accounting treatment and were entered into to fulfill certain covenants of a sale agreement between a commercial paper conduit managed by The Bank of Tokyo-Mitsubishi UFJ, Ltd. and PDC Funding. On December 5, 2013, this agreement was amended on terms consistent with the expiring agreement. The cap agreements provide a credit enhancement feature for the financing contracts sold by PDC Funding to the commercial paper conduit.
	The cap agreements are cancelled and new agreements entered into periodically to maintain consistency with the dollar maximum of the sale agreements and the maturity of the underlying financing contracts. As of April 26, 2014, PDC Funding had purchased an interest rate cap from a bank with a notional amount of $500,000 and a maturity date of February 2022. Patterson Companies, Inc. sold an identical interest rate cap to the same bank.
	Similar to the above agreements, PDC Funding II, and Patterson Companies, Inc. entered into offsetting and identical interest rate cap agreements with a notional amount of $75,000 in fiscal 2013. In August 2013, these agreements were terminated and replaced with offsetting and identical interest rate cap agreements. The notional amount increased to $100,000 and the new maturity date is January 2021.
	In addition to the identical purchased and sold interest rate cap agreements described above, in May 2012 we entered into an interest rate swap agreement with a bank to economically hedge the interest rate risk associated with a portion of the finance contracts we had sold through the special purpose entities.
	These interest rate contracts do not qualify for hedge accounting treatment and, accordingly, we record the fair value of the agreements as an asset or liability and the change as income or expense during the period in which the change occurs.
	In January 2014 the Company entered into a forward interest rate swap agreement with a notional amount of $250,000 and accounted for as cash flow hedge, to hedge interest rate fluctuations in anticipation of refinancing the 5.17% senior notes due March 25, 2015 with a long term loan for $250,000 and a term of ten years.
	The following presents the fair value of interest rate contracts included in the consolidated balance sheets:
		Assets						Liabilities
		Classification	Fair Value					Classification		Fair Value
	Derivative type		April 26,			April 27,				April 26,		April 27,
			2014			2013				2014		2013
	Interest rate contracts	Other noncurrent	$	1,716		$	486	Other noncurrent		$	1,720	$	509
		assets						liabilities
	Interest rate swap	Other noncurrent	$	—		$	—	Other noncurrent		$	5,660	$	—
		assets						liabilities
	The following presents the effect of interest rate contracts on the consolidated statements of income and other comprehensive income:
	Derivative type	Classification of gain  (loss)	Gain (loss)
		recognized on derivative	recognized on derivative
			Fiscal Year
			2014			2013		2012
	Interest rate contracts	Other income (expense), net	$	4		$	78	$	2
	Interest rate swap	Other comprehensive Income	($	5,660	)	$	—	$	—

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Apr. 26, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	9. Fair Value Measurements
	Fair value is the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties. The fair value hierarchy of measurements is categorized into one of three levels based on the lowest level of significant input used:
	Level 1 –	Quoted prices in active markets for identical assets and liabilities at the measurement date.
	Level 2 –	Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	Level 3 –	Unobservable inputs for which there is little or no market data available. These inputs reflect
		management’s assumptions of what market participants would use in pricing the asset or liability.
	Our hierarchy for assets and liabilities measured at fair value on a recurring basis as of April 26, 2014 is as follows:
		Total		Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets		Inputs		(Level 3)
				(Level 1)		(Level 2)
	Assets:
	Cash equivalents	$	51,511	$	51,511	$	—	$	—
	Derivative instruments		1,716		—		1,716		—
	Total assets	$	53,227	$	51,511	$	1,716	$	—
	Liabilities:
	Derivative instruments	$	7,380	$	—	$	7,380	$	—
	Our hierarchy for assets and liabilities measured at fair value on a recurring basis as of April 27, 2013 is as follows:
		Total		Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets		Inputs		(Level 3)
				(Level 1)		(Level 2)
	Assets:
	Cash equivalents	$	282,619	$	282,619		—		—
	Derivative instruments	$	486		—	$	486		—
	Total assets	$	283,105	$	282,619	$	486		—
	Liabilities:
	Derivative instruments	$	509		—	$	509		—
	Cash equivalents – We value cash equivalents at their current market rates. The carrying value of cash equivalents approximates fair value and maturities are less than three months.
	Derivative instruments – Patterson’s derivative instruments consist of interest rate contracts. These instruments are valued using inputs such as interest rates and credit spreads.
	Certain assets are measured at fair value on a nonrecurring basis. These assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments under certain circumstances, such as when there is evidence of impairment. There were no fair value adjustments to such assets in fiscal years 2014, 2013 and 2012.
	Patterson’s debt is not measured at fair value in the consolidated balance sheets. The estimated fair value of our debt as of April 26, 2014 and April 27, 2013 was $742,619 and $774,606, respectively. The fair value of debt was measured using a discounted cash flow analysis based on expected market based yields. These are considered to be Level 2 inputs under the fair value measurements and disclosure guidance.
	The carrying amounts of receivables, net of allowances, accounts payable, and certain accrued and other current liabilities approximated fair value at April 26, 2014 and April 27, 2013.

Securities

Securities	12 Months Ended
	Apr. 26, 2014
Investments Debt And Equity Securities [Abstract]	'
Securities	'
	10. Securities
	On October 25th, 2013 we invested in three time deposits with total principal of $110,000 Canadian dollars. Our time deposit securities are classified as “held-to-maturity” securities as we have both the intent and ability to hold until maturity. They are carried at cost, adjusted for accrued interest and amortization. The current value is not materially different than fair value. The fair value was determined based on a discounted cash flow analysis using unobservable inputs (i.e. level 3 inputs), which include a forward yield curve, the estimated timing of payments and the credit quality of the underlying creditor. Significant changes in any of the significant unobservable inputs in isolation would not result in a materially lower fair value estimate. The interrelationship between these inputs is insignificant. The U.S. dollar equivalents at April 26, 2014, include $40,775, which is classified as a current asset and will mature within one year, and $58,897, which is classified as a noncurrent asset and will mature within two years.

Lease_Commitments

Lease Commitments	12 Months Ended
	Apr. 26, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Lease Commitments	'
	11. Lease Commitments
	Patterson leases facilities for its branch office locations, a few small distribution facilities, and certain equipment. These leases are accounted for as operating leases. Future minimum rental payments under non-cancelable operating leases are as follows at April 26, 2014:
	2015	$	18,981
	2016		15,875
	2017		13,429
	2018		10,557
	2019		7,728
	Thereafter		10,961
	Total minimum payments required	$	77,531
	Rent expense was $21,290, $22,016 and $20,819 for the years ended April 26, 2014, April 27, 2013 and April 28, 2012, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Apr. 26, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	12. Income Taxes
	Significant components of the provision for income taxes are as follows:
		Fiscal Year
		2014			2013			2012
	Current:
	Federal	$	84,353		$	80,290		$	89,612
	Foreign		9,667			13,471			16,726
	State		10,515			10,035			10,570
	Total current		104,535			103,796			116,908
	Deferred:
	Federal		7,501			6,667			872
	Foreign		(240	)		(963	)		(895	)
	State		504			1,345			112
	Total deferred		7,765			7,049			89
	Provision for income taxes	$	112,300		$	110,845		$	116,997
	Deferred tax assets and liabilities are included in “prepaid expenses” and “other current assets” and in “non-current liabilities” on the balance sheet. Significant components of Patterson’s deferred tax assets (liabilities) as of April 26, 2014 and April 27, 2013 are as follows:
		2014			2013
	Deferred current income tax asset (liability):
	Capital accumulation plan	$	5,893		$	5,540
	Inventory related items		5,512			8,170
	Bad debt allowance		1,518			2,092
	LIFO reserve		(16,279	)		(15,901	)
	Other		13,447			17,075
	Deferred net current income tax asset		10,091			16,976
	Deferred long-term income tax (liability) asset:
	Amortizable intangibles		(26,590	)		(27,934	)
	Goodwill		(69,613	)		(62,911	)
	Property, plant, equipment		(4,744	)		(5,390	)
	Stock based compensation expense		8,130			9,603
	Net operating loss carryforwards		6,848			8,070
	Other		(4,276	)		(10,290	)
			(90,245	)		(88,852	)
	Valuation allowance		(3,759	)		(4,477	)
	Deferred net long-term income tax liability		(94,004	)		(93,329	)
	Net deferred income tax liability	$	(83,913	)	$	(76,353	)
	At April 26, 2014, we had foreign net operating loss carryforwards (“NOLs”) of $29,776, the majority of which are attributable to companies outside the U.S. that were acquired in prior years. A valuation allowance has been recorded for a portion of the $6,848 of deferred tax asset resulting from these NOLs because we believe that it is more likely than not that the losses will not be fully utilized due to uncertainties relating to future taxable income from the acquired companies.
	No provision has been made for U.S. federal income taxes on certain undistributed earnings of foreign subsidiaries that we intend to permanently invest or that may be remitted substantially tax-free. The total undistributed earnings that would be subject to federal income tax if remitted under existing law are approximately $254,540 as of April 26, 2014. Determination of the unrecognized deferred tax liability related to these earnings is not practicable because of the complexities with its hypothetical calculation. If a future distribution of these earnings is made, we will be subject to U.S. taxes and withholding taxes payable to various foreign governments. A credit for foreign taxes already paid would be available to reduce the U.S. tax liability.
	Income tax expense varies from the amount computed using the U.S. statutory rate. The reasons for this difference and the related tax effects are shown below:
		Fiscal Year
		2014			2013			2012
	Tax at U.S. statutory rate	$	109,519		$	112,391		$	115,434
	State tax provision, net of federal benefit		7,768			8,322			7,277
	Effect of foreign taxes		461			(4,603	)		(3,944	)
	Permanent differences		(4,843	)		(3,439	)		(702	)
	Other		(605	)		(1,826	)		(1,068	)
		$	112,300		$	110,845		$	116,997
	We have accounted for the uncertainty in income taxes recognized in the financial statements in accordance with ASC Topic 740, “Income Taxes”. This standard clarifies the separate identification and reporting of estimated amounts that could be assessed upon audit. The potential assessments are considered unrecognized tax benefits, because, if it is ultimately determined they are unnecessary, the reversal of these previously recorded amounts will result in a beneficial impact to our financial statements.
	As of April 26, 2014 and April 27, 2013, Patterson’s gross unrecognized tax benefits were $19,687 and $19,155, respectively. If determined to be unnecessary, these amounts (net of deferred tax assets of $5,003 and $4,735, respectively, related to the tax deductibility of the gross liabilities) would decrease our effective tax rate. The gross unrecognized tax benefits are included in other long-term liabilities on the consolidated balance sheet.
	A summary of the changes in the gross amounts of unrecognized tax benefits for the years ended April 26, 2014 and April 27, 2013 are shown below:
		2014			2013
	Balances beginning of period	$	19,155		$	18,099
	Additions for tax positions related to the current year		2,801			2,568
	Additions for tax positions of prior years		1,372			1,638
	Reductions for tax positions of prior years		(893	)		(1,135	)
	Statute expirations		(2,655	)		(1,907	)
	Settlements		(93	)		(108	)
	Balance, end of period	$	19,687		$	19,155
	We also recognize both interest and penalties with respect to unrecognized tax benefits as a component of income tax expense. As of April 26, 2014 and April 27, 2013, we had recorded $2,124 and $2,358, respectively, for interest and penalties. These amounts are also included in other long-term liabilities on the consolidated balance sheet. These amounts, net of related deferred tax assets, if determined to be unnecessary, would decrease our effective tax rate. During the year ended April 26, 2014, we recorded as part of tax expense $542 related to our estimated liability for interest and penalties.
	Patterson files income tax returns, including returns for our subsidiaries, with federal, state, local and foreign jurisdictions. The Internal Revenue Service (“IRS”) has either examined or waived examination for all periods up to and including our fiscal year ended April 24, 2010. Periodically, state, local and foreign income tax returns are examined by various taxing authorities. We do not believe that the outcome of these various examinations would have a material adverse impact on our financial statements.

Segment_and_Geographic_Data

Segment and Geographic Data	12 Months Ended
	Apr. 26, 2014
Segment Reporting [Abstract]	'
Segment and Geographic Data	'
	13. Segment and Geographic Data
	Patterson Companies, Inc. is comprised of three reportable segments: dental supply, veterinary supply, and rehabilitation supply. Our reportable business segments are strategic business units that offer similar products and services to different customer bases. The dental supply segment provides a virtually complete range of consumable dental products, clinical and laboratory equipment and value-added services to dentists, dental laboratories, institutions and other dental healthcare providers throughout North America. The veterinary supply segment is a leading distributor of veterinary supplies, primarily to companion-pet(dogs, cats and other common household pets) and equine veterinary clinics. They also provide products and services used for the diagnosis, treatment and/or prevention of diseases in companion animals and equine throughout the United States and United Kingdom. The worldwide rehabilitation supply segment provides a comprehensive range of distributed and self-manufactured rehabilitation medical supplies and assistive products to acute care hospitals, long-term care facilities, rehabilitation clinics, dealers and schools.
	We evaluate segment performance based on operating income. The corporate office general and administrative expenses are included in the dental supply segment and consist of home office support costs in areas such as information technology, finance, human resources and facilities. If these corporate expenses were allocated to the segments, the results would not be materially different as the dental segment would absorb a significant portion of these expenses. The cost to operate the distribution centers are allocated to the operating units based on the through-put of the unit.
	The following table presents information about Patterson’s reportable segments:
		Fiscal Year
		2014		2013		2012
	Net sales
	Dental supply	$	2,382,096	$	2,379,970	$	2,287,875
	Rehabilitation supply		478,574		501,997		513,340
	Veterinary supply		1,203,045		755,245		734,446
	Consolidated net sales	$	4,063,715	$	3,637,212	$	3,535,661
	Operating income
	Dental supply	$	249,138	$	247,747	$	246,755
	Rehabilitation supply		46,763		65,027		72,442
	Veterinary supply		49,855		41,681		38,812
	Consolidated operating income	$	345,756	$	354,455	$	358,009
	Depreciation and amortization
	Dental supply	$	35,209	$	34,953	$	31,375
	Rehabilitation supply		7,540		7,683		7,472
	Veterinary supply		7,237		3,366		3,362
	Consolidated depreciation and amortization	$	49,986	$	46,002	$	42,209
	Total assets
	Dental supply	$	1,342,333	$	1,442,667	$	1,502,672
	Rehabilitation supply		876,211		881,323		883,287
	Veterinary supply		646,133		357,788		353,409
	Consolidated total assets	$	2,864,677	$	2,681,778	$	2,739,368
	The following table presents sales information by product for Patterson and its reportable segments:
		Fiscal Year
		2014		2013		2012
	Consolidated
	Consumable and printed products	$	2,776,765	$	2,343,407	$	2,312,309
	Equipment and software		973,814		993,767		930,601
	Other		313,136		300,038		292,751
	Total	$	4,063,715	$	3,637,212	$	3,535,661
	Dental supply
	Consumable and printed products	$	1,289,652	$	1,273,222	$	1,263,515
	Equipment and software		828,858		843,880		768,633
	Other		263,586		262,868		255,727
	Total	$	2,382,096	$	2,379,970	$	2,287,875
	Rehabilitation supply
	Consumable and printed products	$	352,181	$	361,164	$	363,004
	Equipment and software		100,936		114,818		123,649
	Other		25,457		26,015		26,687
	Total	$	478,574	$	501,997	$	513,340
	Veterinary supply
	Consumable and printed products	$	1,134,932	$	709,021	$	685,790
	Equipment and software		44,020		35,069		38,319
	Other		24,093		11,155		10,337
	Total	$	1,203,045	$	755,245	$	734,446
	The following table presents information about Patterson by geographic area. No individual country, except for the United States, generated sales greater than 10% of consolidated net sales. There were no material sales between geographic areas.
		Fiscal Year
		2014		2013		2012
	Net sales
	United States	$	3,265,939	$	3,211,979	$	3,104,047
	International		797,776		425,233		431,614
	Total	$	4,063,715	$	3,637,212	$	3,535,661
	Income before tax
	United States	$	289,037	$	273,037	$	273,314
	International		23,875		48,080		56,498
	Total	$	312,912	$	321,117	$	329,812
	Long-lived assets
	United States	$	1,235,830	$	1,176,815	$	1,192,437
	International		213,130		143,627		143,418
Total	$	1,448,960	$	1,320,442	$	1,335,855

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Apr. 26, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	14. Stockholders’ Equity
	Dividends
	The following table presents our declared and paid cash dividends per share on our common stock for the past three years. The dividend declared in the fourth quarter of fiscal 2013 was paid early in the subsequent quarter; all other dividends were declared and paid in the same period. Patterson expects to continue paying a quarterly cash dividend into the foreseeable future.
		Period
	Fiscal year	1		2		3		4
	2014	$	0.16	$	0.16	$	0.16	$	0.2
	2013	$	0.14	$	0.14	$	0.14	$	0.16
	2012	$	0.12	$	0.12	$	0.12	$	0.14
	Share Repurchases
	During fiscal 2014, we repurchased and retired 2,354,000 shares of our common stock for $96,486, or an average of $40.99 per share. During fiscal 2013, we repurchased and retired 5,224,017 shares of our common stock for $181,756, or an average of $34.79 per share. During fiscal 2012, Patterson repurchased and retired 11,954,257 shares of our common stock for $361,047, or an average of $30.20 per share.
	In December 2007, Patterson’s Board of Directors expanded a share repurchase program to allow for the purchase of up to 25 million shares of common stock in open market transactions. As of March 2011, approximately 20.5 million shares had been repurchased under this authorization. At that time, the Board of Directors cancelled and replaced the existing share repurchase program with a new authorization to repurchase an additional 25 million share of common stock. This program was due to expire on March 15, 2016. On March 19, 2013, Patterson’s Board of Directors approved a new share repurchase plan that replaced the existing plan. Under the current plan, up to 25 million shares may be repurchased in open market transactions through March 19, 2018. As of April 26, 2014, 22.0 million shares remain available under the current repurchase authorization.
	Employee Stock Ownership Plan (ESOP)
	During 1990, Patterson’s Board of Directors adopted a leveraged ESOP. In fiscal 1991, under the provisions of the plan and related financing arrangements, Patterson loaned the ESOP $22,000 (the “1990 note”) for the purpose of acquiring its then outstanding preferred stock which was subsequently converted to common stock. The Board of Directors determines the contribution from the Company to the ESOP annually. The contribution is used to retire a portion of the debt, which triggers a release of shares that are then allocated to the employee participants. Shares of stock acquired by the plan are allocated to each participant who has completed 1,000 hours of service during the plan year. The shares under the 1990 note were grandfathered from the accounting provisions of ASC Topic 718-40, “Employer Stock Ownership Plans” (“ASC 718-40”) and therefore the provisions of the former Accounting Practices for Certain Employee Stock Ownership Plans (“SOP 76-3”) apply. Accordingly, the expense recognized when these shares were released and allocated to participants was based on the original cost to acquire the shares. In fiscal 2011, the final payment on the 1990 note was made and all remaining shares were released for allocation to participants. During fiscal 2011 shares secured by the 1990 note with an aggregate cost of $1,635 were committed for release and allocated to ESOP participants.
	In fiscal 2002, Patterson’s ESOP and an ESOP sponsored by the Thompson Dental Company (“Thompson”) were used to facilitate the acquisition and merger of Thompson into Patterson. The net result of this transaction was an additional loan of $12,612 being made to the ESOP and the ESOP acquiring 665,978 shares of common stock. These shares are accounted for under ASC 718-40 and accordingly these shares are not considered outstanding for the computation of earnings per share until the shares are committed for release to the participants. When the shares are committed for release and allocated to the participants, the expense to Patterson is determined based on current fair value. The loan bears interest at current rates but principal did not begin to amortize until fiscal 2012. Beginning in fiscal 2012 and through fiscal 2020, an annual payment of $200 plus interest is due and in fiscal 2020, a final payment of any outstanding principal and interest balance is due. Prepayments of principal can be made at any time without penalty. Of the 665,978 shares issued in the transaction, 97,810 were previously allocated to Thompson employees. The remaining 568,168 shares began to be allocated in fiscal 2004 as interest was paid on the loan. During fiscal 2014, 2013 and 2012, shares secured by the Thompson note with an aggregate fair value of $373, $363 and $298, respectively, were committed for release and allocated to ESOP participants.
	On September 11, 2006, we entered into a third loan agreement with the ESOP and loaned $105,000 (the “2006 note”) for the sole purpose of enabling the ESOP to purchase shares of our common stock. The ESOP purchased 3,159,645 shares with the proceeds from the 2006 note. These shares are also accounted for under ASC 718-40. Interest on the unpaid principal balance accrues at a rate equal to six-month LIBOR, with the rate resetting semi-annually. Interest payments were not required during the period from and including September 11, 2006 through April 30, 2010. On April 30, 2010, accrued and unpaid interest was added to the outstanding principal balance under the note, with interest thereafter accruing on the increased principal amount. Unpaid interest accruing after April 30, 2010 is due and payable on each successive April 30 occurring through September 10, 2026. No principal payments are due until September 10, 2026; however, prepayments can be made without penalty. During fiscal 2014 and 2013, shares secured by the 2006 note with aggregate fair values of $10,959 and $20,214, respectively, were committed for release and allocated to ESOP participants. In fiscal 2012, Patterson contributed $23,639 to the ESOP, which then purchased 844,325 shares for allocation to the participants. No shares secured by the 2006 note were released prior to fiscal 2011.
	At April 26, 2014, a total of 13,851,147 shares of common stock that have been allocated to participants remained in the ESOP and had a fair market value of $566,650. Related to the shares from the Thompson transaction, committed-to-be-released shares were 9,197 and suspense shares were 454,092. Finally, with respect to the 2006 note, committed-to-be-released shares were 270,117 and suspense shares were 2,282,877.
	We anticipate the allocation of the remaining suspense, or unearned, shares to occur over a period of approximately 5 to 10 years. As of April 26, 2014, the fair value of all unearned shares held by the ESOP was approximately $111,969. We will recognize an income tax deduction as the unearned ESOP shares are released. Such deductions will be limited to the ESOP’s original cost to acquire the shares.
	Dividends on allocated shares are passed through to the ESOP participants. Dividends on unallocated shares are used by the ESOP to make debt service payments on the notes due to Patterson.

Stockbased_Compensation

Stock-based Compensation	12 Months Ended
	Apr. 26, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-based Compensation	'
	15. Stock-based Compensation
	The consolidated statements of income for fiscal years 2014, 2013 and 2012 include pre-tax stock-based compensation expense of $8,686 ($5,896 after-tax), $14,625 ($9,452 after-tax), and $12,615 ($8,441 after-tax), respectively, recorded in accordance with the provisions of ASC Topic 718, “Stock Compensation”. All pre-tax expense is included in operating expenses within the consolidated statements of income. The consolidated statement of cash flows presents the pre-tax stock-based compensation expense as an adjustment to reconcile net income to net cash provided by operating activities. In addition, benefits associated with tax deductions in excess of recognized compensation expense are presented as a cash inflow from financing activities. For fiscal years 2014, 2013 and 2012, these excess benefits totaled $1,290, $2,487, and $1,371, respectively.
	As of April 26, 2014, the total compensation cost, before income taxes, related to non-vested awards yet to be recognized was $29,400, and it is expected to be recognized over a weighted average period of approximately 5.1 years.
	Description of General Methods and Assumptions Used to Estimate Fair Value
	The following describes certain methods and assumptions used to estimate the fair value of stock-based compensation awards. Further information is presented below within this Note that may be unique to a particular award or group of awards.
	Expected dividend yield – Patterson’s initial quarterly dividend occurred in the fourth quarter of fiscal 2010. Accordingly, the expected dividend yield used had been 0% for awards issued prior to that time. For awards issued since, Patterson has included an expected dividend yield based on estimates as of the grant date of awards.
	Expected stock price volatility – We have considered historical volatility trends, implied future volatility based on certain traded options and other factors.
	Risk-free interest rate –We base the risk-free interest rate on the U.S. Treasury yield curve in effect at the grant date with similar terms to the expected term of the award.
	Expected term of stock options and restricted stock – We estimate the expected term, or life, of awards based on several factors, including grantee types, vesting schedules, contractual terms and various factors surrounding exercise behavior of different groups.
	Director and Employee Stock Option Plans
	In June 1992, we adopted a Director Stock Option Plan. Options were granted at the fair market value of the underlying stock on the date of grant, vested over one year, and were exercisable for a period of four years commencing one year after the date of grant.
	In September 2001, we adopted a new Director Stock Option Plan. A total of 800,000 shares of common stock have been reserved for issuance under this plan. Options are granted at fair market value of the underlying stock on the option grant date, vest over one year, and are exercisable for a period of nine years commencing one year after the grant date.
	In June 1992, we adopted the Patterson Dental Company 1992 Stock Option Plan, a plan for employees. Due to the expiration of this plan in fiscal 2003, no options remain available for future issuance under this plan. In September 2002, we adopted a new employee equity award plan. A total of 6,000,000 shares of common stock were reserved for issuance under the plan. In September 2004, our shareholders voted to approve the Amended and Restated 2002 Stock Option Plan, a restatement of the 2002 plan. Upon approval, the Plan was renamed the “Patterson Companies, Inc. Equity Incentive Plan” (“Equity Incentive Plan”).
	The Equity Incentive Plan amendments did not change the number of shares reserved for awards under the plan. The Equity Incentive Plan authorizes various award types to be issued under the plan, including stock options, restricted stock and restricted stock units, stock bonuses, cash bonuses, stock appreciation rights, performance awards and dividend equivalents. Awards may have a term no longer than ten years and vesting terms are determined by the compensation committee of the Board of Directors. The minimum restriction period for restricted stock and restricted stock units is three years, or one year in the case of performance-based awards. Additionally, a plan amendment in September 2010 increased the maximum number of shares that may be issued pursuant to awards of restricted stock, restricted stock awards and stock bonuses from 2,000,000 shares to 6,000,000 shares. Prior to fiscal 2006, only stock option awards had been granted under the Equity Incentive Plan. During fiscal years 2014, 2013 and 2012, expense recognized related to stock options was $768, $1,175, and $1,553, respectively.
	The fair value of stock options granted was estimated as of the grant date using a Black-Scholes option-pricing model with the following weighted average assumptions during fiscal years 2014, 2013 and 2012:
			April 26,			April 27,			April 28,
			2014			2013			2012
	Expected dividend yield			1.8	%		1.6	%		1.5	%
	Expected stock price volatility			30	%		30.6	%		33	%
	Risk-free interest rate			1.5	%		1.4	%		2.5	%
	Expected life of options (years)			7.1			7.5			7.4
	Following is a summary of stock option activity for all plans during fiscal years 2014, 2013 and 2012 (share amounts in thousands):
			Total Outstanding
			Number			Exercise			Intrinsic
			of			Price (a)			Value
			Options
	Balance as of April 30, 2011			1,273		$	29.82
	Granted			64			33.9
	Exercised			(232	)		24.11
	Canceled			(119	)		29.64
	Balance as of April 28, 2012			986		$	31.45
	Granted			56			34.1
	Exercised			(290	)		22.49
	Canceled			(31	)		33.79
	Balance as of April 27, 2013			721		$	35.03
	Granted			57			39.33
	Exercised			(345	)		35.73
	Canceled			(44	)		33.11
	Balance as of April 26, 2014			389		$	35.29		$	2,168
	Vested or expected to vest as of April 26, 2014			306		$	35.89		$	1,667
	Exercisable as of April 26, 2014			113		$	40.75		$	498
	(a)	Weighted-average exercise price
	The weighted average fair values per share of options granted during fiscal years 2014, 2013 and 2012 were $11.02, $10.15, and $11.47, respectively. The weighted average remaining contractual lives of options outstanding and options exercisable as of April 26, 2014 were 4.3 and 2.5 years, respectively. We settle stock option exercises with newly issued common shares.
	Related to stock options exercised, the intrinsic value, cash received and tax benefits realized were $1,722, $12,309 and $1,273, respectively, in fiscal 2014; $3,397, $6,518 and $641, respectively, in fiscal 2013; $1,731, $5,604 and $442, respectively, in fiscal 2012.
	Restricted Stock and Performance Unit Awards
	In fiscal 2006, we began to issue restricted stock and performance unit awards under the Equity Incentive Plan. The grant date fair value is based on the closing stock price on the day of the grant. Restricted stock awards to employees generally vest over a five, seven or nine-year period and are subject to forfeiture provisions. Certain restricted stock awards, which are held by line management, are subject to accelerated vesting provisions beginning three years after the grant date, based on certain operating goals. Restricted stock awards are also granted to non-employee directors on the date of each annual Board meeting. These awards vest over three years. The performance unit awards, issued primarily to executive management, are earned at the end of a three-year period if certain operating goals are met, and are settled in an equivalent number of common shares or in cash as determined by the compensation committee of the Board of Directors. The satisfaction of operating goals is not finally determined until the end of a three-year period. Accordingly, Patterson recognizes expense related to performance unit awards over the requisite service period using the straight-line method based on the outcome that is probable. For fiscal year 2013 and 2012, we no longer believe achievement is probable, therefore, no expense has been recognized. During fiscal years 2014, 2013 and 2012, expense recognized related to restricted stock and performance unit awards was $4,793, $10,255 and $7,962 , respectively. The total intrinsic value of restricted stock awards that vested in fiscal 2014, 2013 and 2012 was $6,831, $6,923, and $4,559, respectively. Patterson granted performance units in fiscal 2014 that can be earned at the end of fiscal 2016 subject to the achievement of certain financial objectives.
	The following tables summarize information concerning non-vested restricted stock awards and performance unit awards for fiscal years 2014, 2013 and 2012:
			Restricted Stock Awards
			Shares			Weighted
						Average
						Grant-Date
						Fair Value
	Outstanding at April 30, 2011			1,111		$	29.22
	Granted			272			34.6
	Vested			(138	)		(25.45	)
	Forfeitures			(83	)		(29.25	)
	Outstanding at April 28, 2012			1,162		$	30.92
	Granted			314			34.1
	Vested			(192	)		(35.62	)
	Forfeitures			(127	)		(30.98	)
	Outstanding at April 27, 2013			1,157		$	31.82
	Granted			283			38.02
	Vested			(174	)		(38.76	)
Forfeitures			(43	)		(31.91	)
Outstanding at April 26, 2014			1,223		$	33.02
		Performance Unit Awards
		Shares			Weighted
					Average
					Grant-Date
					Fair Value
Outstanding at April 30, 2011			102		$	35.41
Forfeitures and cancellations			(6	)		(35.41	)
Outstanding at April 28, 2012			96		$	35.41
Granted			130			34.09
Forfeitures and cancellations			(21	)		(34.09	)
Outstanding at April 27, 2013			205		$	34.09
Granted			124			38.05
Forfeitures and cancellations			(2	)		(34.75	)
Outstanding at April 26, 2014			327		$	35.59
Employee Stock Purchase Plan
In June 1992, Company adopted an Employee Stock Purchase Plan (the “Stock Purchase Plan”). A total of 4,750,000 shares of common stock were reserved for issuance under the Stock Purchase Plan. In June 2012, our Board of Directors approved to increase the number of shares available to 6,750,000. The Stock Purchase Plan, which is intended to qualify under Section 423 of the Internal Revenue Code, is administered by the Board of Directors or by a committee appointed by the Board of Directors and follows a calendar plan year. Employees are eligible to participate after nine months of employment, if they are employed for at least 20 hours per week and more than five months per year. The Stock Purchase Plan permits eligible employees to purchase common stock through payroll deductions, which may not exceed 10 percent of an employee’s compensation, at 85% of the lower of the fair market value of the common stock on the offering date or at the end of each three-month period following the offering date during the applicable offering period. Employees may end their participation in the offering at any time during the offering period, and participation ends automatically on termination of employment. At April 26, 2014, there were 1,733,271 shares available for purchase under the Stock Purchase Plan.
The Stock Purchase Plan includes a look-back option, and, accordingly, there are several option elements for which the fair value is estimated on the grant date using the Black-Scholes option-pricing model. Total expense recognized related to the employee stock purchase plan was $1,838, $1,816 and $1,772 during fiscal years 2014, 2013 and 2012, respectively. The following table summarizes the weighted-average assumptions relating to the Stock Purchase Plan for fiscal years 2014, 2013 and 2012:
		2014			2013			2012
Expected dividend yield			1.6	%		1.6	%		1.4	%
Expected stock price volatility			31	%		31	%		31.3	%
Risk-free interest rate			0.1	%		0.2	%		0.2	%
Expected life of options (years)			0.5			0.5			0.5
Capital Accumulation Plan
In 1996, we adopted an employee Capital Accumulation Plan (the “CAP Plan”). A total of 6,000,000 shares of common stock are reserved for issuance under the CAP Plan. Key employees of Patterson or its subsidiaries are eligible to participate by purchasing common stock through payroll deductions, which must be between 5% and 25% of an employee’ compensation, at 75% of the price of the common stock at the beginning of or the end of the calendar year, whichever is lower. The shares issued are restricted stock and are held in the custody of Patterson until the restrictions lapse. The restriction period is three years from the beginning of the plan year, but restricted shares are subject to forfeiture provisions. At April 26, 2014, 2,128,497 shares were available for purchase under the CAP Plan.
Based on the provisions of the CAP Plan, there are option elements for which the fair value is estimated on the grant date using the Black-Scholes option-pricing model. Total expense recognized related to the CAP Plan was $1,287, $1,379, and $1,327 during fiscal years 2014, 2013 and 2012, respectively. The following table summarizes the weighted-average assumptions relating to the CAP Plan for fiscal years 2014, 2013 and 2012:
		2014			2013			2012
Expected dividend yield			1.6	%		1.6	%		1.4	%
Expected stock price volatility			31	%		31	%		31.3	%
Risk-free interest rate			0.3	%		0.3	%		0.3	%
Expected life of options (years)			1			1			1

Litigation

Litigation	12 Months Ended
	Apr. 26, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Litigation	'
	16. Litigation
	We are involved in various product related, employment related and other legal proceedings arising in the ordinary course of business. Some of these proceedings involve product liability claims arising out of the use of products we distribute. Product liability indemnification is generally obtained from our suppliers. However, in the event a supplier of a defective product is unable to pay a judgment for which Patterson may be jointly liable, Patterson would have liability for the entire judgment.
	We maintain product liability insurance coverage for any potential liability for claims arising out of products sold by us. While we believe our insurance coverage is adequate, there can be no assurance that our insurance coverage is sufficient or will be available to in adequate amounts or at reasonable costs in the future. Also, there can be no assurance that the indemnification agreements with our suppliers will provide adequate protection. In addition, future claims brought against us could involve claims not covered by insurance or indemnification agreements, and could have a material adverse effect on our business or financial condition.
	As of April 26, 2014 and April 27, 2013, Patterson had accrued our best estimate of potential losses relating to product liability and other claims that were probable to result in a liability and for which it was possible to reasonably estimate a loss. These accrued amounts, as well as related expenses, have not been material to our financial position, results of operations or cash flows. Our method for determining estimated losses considers currently available facts, presently enacted laws and regulations and other external factors, including probable recoveries from third parties. We also disclose the nature of and range of loss for claims against us when losses are reasonably possible and material.

Quarterly_Results_unaudited

Quarterly Results (unaudited)	12 Months Ended
	Apr. 26, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Results (unaudited)	'
	17. Quarterly Results (unaudited)
	Quarterly results are determined in accordance with the accounting policies used for annual data and include certain items based upon estimates for the entire year. All fiscal quarters include results for 13 weeks. The following table summarizes results for fiscal 2014 and 2013.
		Quarter Ended
		Apr. 26,		Jan. 25,		Oct. 27,		July 28,
		2014		2014		2013		2013
	Net sales	$	1,102,077	$	1,082,679	$	998,834	$	880,125
	Gross profit		315,868		311,461		289,431		281,518
	Operating income		92,601		96,651		75,223		81,281
	Net income		55,671		57,021		42,028		45,892
	Earnings per share – basic	$	0.56	$	0.56	$	0.42	$	0.45
	Earnings per share – diluted	$	0.55	$	0.56	$	0.41	$	0.45
		Quarter Ended
		Apr. 27,		Jan. 26,		Oct. 27,		July 28,
		2013		2013		2012		2012
	Net sales	$	964,933	$	915,861	$	867,193	$	889,225
	Gross profit		324,177		300,293		280,599		285,700
	Operating income		104,456		89,538		77,869		82,592
	Net income		63,562		53,630		45,542		47,538
	Earnings per share – basic	$	0.63	$	0.53	$	0.44	$	0.45
	Earnings per share – diluted	$	0.62	$	0.52	$	0.44	$	0.45

SCHEDULE_II_VALUATION_AND_QUAL

SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Apr. 26, 2014
Valuation And Qualifying Accounts [Abstract]	'
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS	'
	SCHEDULE II
	VALUATION AND QUALIFYING ACCOUNTS
	PATTERSON COMPANIES, INC.
	(Dollars in thousands)
		Balance at		Charged to		Charged		Deductions		Balance at
		Beginning		Costs and		to Other				End of
		of Period		Expenses		Accounts				Period
	Year ended April 26, 2014:
	Deducted from asset accounts:
	Allowance for doubtful accounts	$	5,808	$	3,220	$	3,552	$	2,707	$	9,873
	LIFO inventory adjustment	$	70,415	$	4,192	$	—	$	—	$	74,607
	Inventory obsolescence reserve		6,333		14,846		391		12,907		8,663
	Total inventory reserve	$	76,748	$	19,038	$	391	$	12,907	$	83,270
	Year ended April 27, 2013:
	Deducted from asset accounts:
	Allowance for doubtful accounts	$	7,831	$	1,119	$	—	$	3,142	$	5,808
	LIFO inventory adjustment	$	66,808	$	3,607	$	—	$	—	$	70,415
	Inventory obsolescence reserve		5,456		10,863		—		9,986		6,333
	Total inventory reserve	$	72,263	$	14,471	$	—	$	9,986	$	76,748
	Year ended April 28, 2012:
	Deducted from asset accounts:
	Allowance for doubtful accounts	$	8,365	$	2,445	$	—	$	2,979	$	7,831
	LIFO inventory adjustment	$	61,385	$	5,422	$	—	$	—	$	66,807
	Inventory obsolescence reserve		5,844		11,508		—		11,896		5,456
	Total inventory reserve	$	67,229	$	16,930	$	—	$	11,896	$	72,263

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Apr. 26, 2014
Accounting Policies [Abstract]	'
Description of Business	'
	Description of Business
	Patterson Companies, Inc., (referred to herein as “Patterson” or in the first person notations “we,” “our,” and “us”) is a value-added distributor serving the North American dental supply, U.S. and U.K. veterinarian supply and the worldwide rehabilitation and assistive products supply market. Patterson Companies has three reportable segments: dental supply, veterinary supply and rehabilitation supply.
Basis of Presentation	'
	Basis of Presentation
	The consolidated financial statements include the accounts of our wholly owned subsidiaries. Intercompany transactions and balances have been eliminated in consolidation. The respective assets of PDC Funding Company, LLC and PDC Funding Company II, LLC, would be available first and foremost to satisfy the claims of their respective creditors. There are no known creditors of PDC Funding Company, LLC or PDC Funding Company II, LLC.
Fiscal Year End	'
	Fiscal Year End
	We utilize a fifty-two, fifty-three week fiscal year ending on the last Saturday in April. Accordingly, fiscal years 2014, 2013 and 2012 included fifty-two weeks.
Use of Estimates in the Preparation of Financial Statements	'
	Use of Estimates in the Preparation of Financial Statements
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash equivalents consist primarily of investments in money market funds and government securities. The maturity of these securities at the time of purchase is 90 days or less. All cash and cash equivalents are classified as available-for-sale and carried at fair value, which approximates cost.
Inventory	'
	Inventory
	Inventory consists of merchandise held for sale and is stated at the lower of cost or market. Cost is determined using the last-in, first-out (LIFO) method for all inventories, except for foreign inventories and manufactured inventories, which are valued using the first-in, first-out (FIFO) method. Inventories valued at LIFO represent 75% and 83% of total inventories at April 26, 2014 and April 27, 2013, respectively.
	The accumulated LIFO reserve was $74,607 at April 26, 2014 and $70,415 at April 27, 2013. We believe that inventory replacement cost exceeds the inventory balance by an amount approximating the LIFO reserve.
Property and Equipment	'
	Property and Equipment
	Property and equipment are stated at cost. Depreciation is calculated on the straight-line method over estimated useful lives of up to 39 years for buildings or the expected remaining life of purchased buildings, the term of the lease for leasehold improvements, 3 years for laptops, 5 years for data processing equipment, and 5 to 10 years for office furniture and equipment.
Goodwill and Other Indefinite-Lived Intangible Assets	'
	Goodwill and Other Indefinite-Lived Intangible Assets
	Goodwill represents the excess of cost over the fair value of identifiable net assets of businesses acquired. We have three reporting units as of April 26, 2014, which are the same as our reportable segments. Other indefinite-lived intangible assets include copyrights, trade names and trademarks.
	We evaluate goodwill at least annually using a qualitative assessment to determine whether it is more likely than not that the fair value of any reporting unit is less than its carrying amount. If we determine that the fair value of the reporting unit may be less than its carrying amount, we evaluate goodwill using a two-step impairment test. Otherwise, we conclude that no impairment is indicated and we do not perform the two-step impairment test.
	The first step of the goodwill impairment test compares the book value of a reporting unit, including goodwill, with its fair value, as determined primarily by its discounted cash flows. If the book value of a reporting unit exceeds its fair value, the second step of the impairment test is performed to determine the amount of goodwill impairment loss to be recorded. The determination of fair value involves uncertainties because it requires management to make assumptions and to apply judgment to estimate industry and economic factors and the profitability of future business strategies. Patterson conducts impairment testing based on current business strategy in light of present industry and economic conditions, as well as future expectations. Additionally, in assessing goodwill for impairment, the reasonableness of the implied control premium is considered based on market capitalizations and recent market transactions.
	Other indefinite-lived intangible assets are assessed for impairment by comparing the carrying value of an asset with its fair value. If the carrying value exceeds fair value, an impairment loss is recognized in an amount equal to the excess. The determination of fair value involves assumptions, including projected revenues and gross profit levels, as well as consideration of any factors that may indicate potential impairment.
	In the fourth quarter of fiscal 2014, management completed its annual goodwill and other indefinite-lived intangible asset impairment tests and determined there was no impairment. Although we believe estimates and assumptions used in estimating cash flows and determining fair value are reasonable, making material changes to such estimates and assumptions could materially affect such impairment analyses and financial results, including an impairment charge that could be material.
	The medical reporting unit was evaluated using a quantitative assessment for impairment testing. This reporting unit has a higher level of sensitivity to impairment as management currently assesses the various estimates and assumptions used to conduct these tests. A significant reduction in these assumptions from further softening in medical utilizations in the U.S. or more severe austerity measures in the United Kingdom could cause us to recognize a material impairment charge on this reporting unit. At April 26, 2014, the estimated fair value of this reporting unit exceeded its book value by approximately 6%.
Long-Lived Assets	'
	Long-Lived Assets
	Long-lived assets, including definite-lived intangible assets, are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable through the estimated undiscounted future cash flows derived from such assets. Our definite-lived intangible assets primarily consist of an exclusive distribution agreement and customer lists. When impairment exists, the related assets are written down to fair value. No impairment was recognized in the periods presented.
Financial Instruments	'
	Financial Instruments
	We account for derivative financial instruments under the provisions of Accounting Standard Codification Topic 815, “Derivatives and Hedging.” Our use of derivative financial instruments is generally limited to managing well-defined interest rate risks. Patterson does not use financial instruments or derivatives for any trading purposes.
Revenue Recognition	'
	Revenue Recognition
	Revenues are generated from the sale of consumable products, equipment, software products and services, technical service parts and labor, freight and delivery charges, and other sources. Revenues are recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and there is reasonable assurance of collection of the sale. Estimates for returns, damaged goods, rebates, loyalty programs and other revenue allowances are made at the time the revenue is recognized based on the historical experience for such items. In addition to revenues generated from the distribution of consumable products under conventional arrangements (buy/sell agreements) where the full market value of the product is recorded as revenue, the veterinary segment may earn a small amount of commission income for services provided under agency agreements with certain pharmaceutical manufacturers. The services generally consist of detailing the product and taking the customer’s order. The agency agreement contrasts to a buy/sell agreement in that the veterinary segment does not purchase and handle the product or bill and collect from the customer in an agency relationship with a vendor.
	Consumable product sales are recorded upon delivery, except in those circumstances where terms of the sale are FOB shipping point. Commissions under agency agreements are recorded when the services are provided.
	Equipment and software product revenues are recognized upon delivery and, if necessary, installation. In those circumstances where terms of the sale are FOB shipping point, revenues are recognized when products are transferred to the shipping carrier. Revenue derived from post contract customer support for software is deferred and recognized ratably over the period in which the support is provided. Patterson provides financing for select equipment and software sales. Revenue is recorded at the present value of the finance contract, with discount, if any, and interest income recognized over the life of the finance contract as “other income”. See Note 6 to the Consolidated Financial Statements, for more information regarding customer financing.
	Other revenue, including freight and delivery charges and technical service parts and labor, is recognized when the related product revenue is recognized or when the product or services are provided to the customer.
	The receivables that result from the recognition of revenue are reported net of the related allowances discussed above. Patterson maintains a valuation allowance based upon the expected collectability of receivables held. Estimates are used to determine the valuation allowance and are based on several factors, including historical collection data, economic trends and credit worthiness of customers. Receivables are written off when we determine the amounts to be uncollectible, typically upon customer bankruptcy or non-response to continuous collection efforts. The portions of receivable amounts that are not expected to be collected during the next twelve months are classified as long-term.
	Patterson has a relatively large, dispersed customer base and no single customer accounts for more than 2% of consolidated net sales. In addition, the equipment sold to customers under finance contracts generally serves as collateral for the contract and the customer provides a personal guarantee as well.
Patterson Advantage Loyalty Program	'
	Patterson Advantage Loyalty Program
	The Dental segment provides a point-based awards program to qualifying customers involving the issuance of “Patterson Advantage dollars” which can be used toward equipment and technology purchases. The program was initiated on January 1, 2009 and runs on a calendar year schedule. Patterson Advantage dollars earned during a program year expire one year after the end of the program year. The cost and corresponding liability associated with the program are recognized as contra-revenue in accordance with ASC Topic 605-50, “Revenue Recognition-Customer Payments and Incentives.” As of April 26, 2014, we believe we have sufficient experience with the program to reasonably estimate the amount of Patterson Advantage dollars that will not be redeemed and thus have recorded a liability for 87% of the maximum potential amount that could be redeemed. We use the redemption recognition method and we recognize the estimated value of unused Advantage dollars as a percentage of Patterson Advantage dollars earned. Breakage recognized was immaterial to all periods presented.
Freight and Delivery Charges	'
	Freight and Delivery Charges
	Freight and delivery charges are included in “cost of sales”.
Advertising	'
	Advertising
	We expense all advertising and promotional costs as incurred, except for direct marketing expenses, which are expensed over the shorter of the life of the asset or one year. Total advertising and promotional expenses were $18,263, $19,721 and $18,811 for fiscal years 2014, 2013, and 2012, respectively. Deferred direct-marketing expenses included in prepaid and other current assets on the consolidated balance sheet as of April 26, 2014, and April 27, 2013 were $2,031 and $1,845, respectively.
Income Taxes	'
	Income Taxes
	The liability method is used to account for income tax expense. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse.
	Valuation allowances are established for deferred tax assets if, after assessment of available positive and negative evidence, it is more likely than not that the deferred tax asset will not be fully realized.
Employee Stock Ownership Plan (ESOP)	'
	Employee Stock Ownership Plan (ESOP)
	Compensation expense related to our defined contribution ESOP is computed based on the shares allocated method.
Self-insurance	'
	Self-insurance
	Patterson is self-insured for certain losses related to general liability, product liability, automobile, workers’ compensation and medical claims. We estimate our liabilities based upon an analysis of historical data and actuarial estimates. While current estimates are believed reasonable based on information currently available, actual results could differ and affect financial results due to changes in the amount or frequency of claims, medical cost inflation or other factors. Historically, actual results related to these types of claims have not varied significantly from estimated amounts.
Stock-based Compensation	'
	Stock-based Compensation
	We recognize stock-based compensation expense based on the grant-date fair value of awards estimated in accordance with ASC Topic 718, “Stock Compensation”.
Comprehensive Income	'
	Comprehensive Income
	Comprehensive income is computed as net income plus certain other items that are recorded directly to stockholders’ equity. Significant items included in comprehensive income are foreign currency translation adjustments and the effective portion of cash flow hedges. Foreign currency translation adjustments do not include a provision for income tax because earnings from foreign operations are considered to be indefinitely reinvested outside the U.S.
Earnings Per Share	'
	Earnings Per Share
	The amount of basic earnings per share is computed by dividing net income by the weighted average number of outstanding common shares during the period. The amount of diluted earnings per share is computed by dividing net income by the weighted average number of outstanding common shares and common share equivalents, when dilutive, during the period.
	The following table sets forth the denominator for the computation of basic and diluted earnings per share. There were no material adjustments to the numerator.
		Fiscal Year
		2014		2013		2012
		(in thousands)
	Denominator:
	Denominator for basic earnings per share – weighted average shares		100,727		103,030		110,121
	Effect of dilutive securities – stock options, restricted stock and stock purchase plans		916		777		725
	Denominator for diluted earnings per share – adjusted weighted average shares		101,643		103,807		110,846
	Options to purchase 39, 362 and 520 shares of common stock during fiscal years 2014, 2013 and 2012, respectively, were excluded from the calculation of diluted earnings per share because the effect would have been anti-dilutive. Unvested restricted stock awards outstanding which were excluded from the calculation of diluted earnings per share during fiscal years 2014, 2013 and 2012 were 0, 0 and 140, respectively, because the effect would have been anti-dilutive.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Apr. 26, 2014
Accounting Policies [Abstract]	'
Computation of Basic and Diluted Earnings Per Share	'
	The following table sets forth the denominator for the computation of basic and diluted earnings per share. There were no material adjustments to the numerator.
		Fiscal Year
		2014		2013		2012
		(in thousands)
	Denominator:
	Denominator for basic earnings per share – weighted average shares		100,727		103,030		110,121
	Effect of dilutive securities – stock options, restricted stock and stock purchase plans		916		777		725
	Denominator for diluted earnings per share – adjusted weighted average shares		101,643		103,807		110,846

Cash_and_cash_equivalents_Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Apr. 26, 2014
Cash And Cash Equivalents [Abstract]	'
Cash and cash equivalents	'
	At April 26, 2014 and April 27, 2013, cash and cash equivalents consisted of the following:
		April 26,		April 27,
		2014		2013
	Cash on hand	$	213,397	$	222,609
	Money market funds		51,511		282,619
	Total	$	264,908	$	505,228

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Apr. 26, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Changes in Carrying Value of Goodwill	'
	The changes in the carrying value of goodwill for each of our reportable segments for the fiscal year ended April 26, 2014 are as follows:
		Balance at			Acquisition			Other			Balance at
		April 27, 2013			Activity			Activity			April 26, 2014
	Dental supply	$	137,867		$	649		$	(1,053	)	$	137,463
	Rehabilitation supply		549,020			—			(4,013	)		545,007
	Veterinary supply		136,853			23,374			1,736			161,963
	Total	$	823,740		$	24,023		$	(3,330	)	$	844,433
Balances of Other Intangible Assets Excluding Goodwill	'
	Balances of other intangible assets excluding goodwill are as follows:
		April 26,			April 27,
		2014			2013
	Unamortized – indefinite lived:
	Copyrights, trade names and trademarks	$	76,464		$	76,464
	Amortized:
	Distribution agreement, customer lists and other		286,365			235,781
	Less: Accumulated amortization		(139,67	)		(115,589	)
	Net amortized intangible assets		146,686			120,192
	Total identifiable intangible assets, net	$	223,150		$	196,656

Acquisitions_and_Equity_Invest1

Acquisitions and Equity Investments (Tables)	12 Months Ended
	Apr. 26, 2014
Business Combinations [Abstract]	'
Acquisitions Completed	'
	We acquired 100% of all companies listed below:
	Entity	Segment
	Fiscal 2014:
	Mercer Mastery	Dental supply
	National Veterinary Supply	Veterinary supply
	Fiscal 2013:
	Iowa Dental Supply	Dental supply
	Universal Vaporizer Support	Veterinary supply
	Fiscal 2012:
	American Veterinarian Supply Corp.	Veterinary supply
	Surgical Synergies Pty Ltd.	Rehabilitation supply
	Orthoplast	Rehabilitation supply
Purchase Price Allocation to Acquired Assets, Liabilities, and Goodwill	'
	Therefore, an allocation of the purchase price to the acquired assets, liabilities, and goodwill is presented in the table below.
	At August 16, 2013 (in thousands)
	Receivables	$	113,037
	Inventory		45,785
	Prepaid expenses and other current assets		1,187
	Property, plant and equipment		2,622
	Goodwill		23,374
	Identifiable intangibles		45,337
	Accounts payable		(79,916	)
	Others accrued liabilities		(8,733	)
	Purchase price	$	142,693

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Apr. 26, 2014
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	Property and equipment consisted of the following items:
		April 26,			April 27,
		2014			2013
	Land	$	14,925		$	14,811
	Buildings		129,360			127,364
	Leasehold improvements		18,295			16,751
	Furniture and equipment		152,899			139,261
	Data processing equipment		109,580			98,117
	Construction-in-progress		18,110			5,594
			443,169			401,898
	Accumulated depreciation		(238,230	)		(209,878	)
	Property and equipment, net	$	204,939		$	192,020

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Apr. 26, 2014
Debt Disclosure [Abstract]	'
Debt	'
	Patterson’s debt consists of the following:
		April 26, 2014		April 27, 2013
	5.17% senior notes due fiscal 2015	$	250,000	$	250,000
	5.75% senior notes due fiscal 2018		150,000		150,000
	2.95% senior notes due fiscal 2019		60,000		60,000
	3.59% senior notes due fiscal 2022		165,000		165,000
	3.74% senior notes due fiscal 2024		100,000		100,000
	Total debt		725,000		725,000
	Less: current debt obligations		—		—
	Long-term debt	$	725,000	$	725,000

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Apr. 26, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Fair Value of Interest Rate Contracts on Consolidated Balance Sheets	'
	The following presents the fair value of interest rate contracts included in the consolidated balance sheets:
		Assets						Liabilities
		Classification	Fair Value					Classification		Fair Value
	Derivative type		April 26,			April 27,				April 26,		April 27,
			2014			2013				2014		2013
	Interest rate contracts	Other noncurrent	$	1,716		$	486	Other noncurrent		$	1,720	$	509
		assets						liabilities
	Interest rate swap	Other noncurrent	$	—		$	—	Other noncurrent		$	5,660	$	—
		assets						liabilities
Effect of Interest Rate Contracts on Consolidated Statements of Income	'
	The following presents the effect of interest rate contracts on the consolidated statements of income and other comprehensive income:
	Derivative type	Classification of gain  (loss)	Gain (loss)
		recognized on derivative	recognized on derivative
			Fiscal Year
			2014			2013		2012
	Interest rate contracts	Other income (expense), net	$	4		$	78	$	2
	Interest rate swap	Other comprehensive Income	($	5,660	)	$	—	$	—

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Apr. 26, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	Our hierarchy for assets and liabilities measured at fair value on a recurring basis as of April 26, 2014 is as follows:
		Total		Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets		Inputs		(Level 3)
				(Level 1)		(Level 2)
	Assets:
	Cash equivalents	$	51,511	$	51,511	$	—	$	—
	Derivative instruments		1,716		—		1,716		—
	Total assets	$	53,227	$	51,511	$	1,716	$	—
	Liabilities:
	Derivative instruments	$	7,380	$	—	$	7,380	$	—
	Our hierarchy for assets and liabilities measured at fair value on a recurring basis as of April 27, 2013 is as follows:
		Total		Quoted		Significant		Significant
				Prices in		Other		Unobservable
				Active		Observable		Inputs
				Markets		Inputs		(Level 3)
				(Level 1)		(Level 2)
	Assets:
	Cash equivalents	$	282,619	$	282,619		—		—
	Derivative instruments	$	486		—	$	486		—
	Total assets	$	283,105	$	282,619	$	486		—
	Liabilities:
	Derivative instruments	$	509		—	$	509		—

Lease_Commitments_Tables

Lease Commitments (Tables)	12 Months Ended
	Apr. 26, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Future Minimum Rental Payments under Non-Cancelable Operating Leases	'
	Future minimum rental payments under non-cancelable operating leases are as follows at April 26, 2014:
	2015	$	18,981
	2016		15,875
	2017		13,429
	2018		10,557
	2019		7,728
	Thereafter		10,961
	Total minimum payments required	$	77,531

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Apr. 26, 2014
Income Tax Disclosure [Abstract]	'
Components of Provision for Income Taxes	'
	Significant components of the provision for income taxes are as follows:
		Fiscal Year
		2014			2013			2012
	Current:
	Federal	$	84,353		$	80,290		$	89,612
	Foreign		9,667			13,471			16,726
	State		10,515			10,035			10,570
	Total current		104,535			103,796			116,908
	Deferred:
	Federal		7,501			6,667			872
	Foreign		(240	)		(963	)		(895	)
	State		504			1,345			112
	Total deferred		7,765			7,049			89
	Provision for income taxes	$	112,300		$	110,845		$	116,997
Components of Deferred Tax Assets (Liabilities)	'
	Significant components of Patterson’s deferred tax assets (liabilities) as of April 26, 2014 and April 27, 2013 are as follows:
		2014			2013
	Deferred current income tax asset (liability):
	Capital accumulation plan	$	5,893		$	5,540
	Inventory related items		5,512			8,170
	Bad debt allowance		1,518			2,092
	LIFO reserve		(16,279	)		(15,901	)
	Other		13,447			17,075
	Deferred net current income tax asset		10,091			16,976
	Deferred long-term income tax (liability) asset:
	Amortizable intangibles		(26,590	)		(27,934	)
	Goodwill		(69,613	)		(62,911	)
	Property, plant, equipment		(4,744	)		(5,390	)
	Stock based compensation expense		8,130			9,603
	Net operating loss carryforwards		6,848			8,070
	Other		(4,276	)		(10,290	)
			(90,245	)		(88,852	)
	Valuation allowance		(3,759	)		(4,477	)
	Deferred net long-term income tax liability		(94,004	)		(93,329	)
	Net deferred income tax liability	$	(83,913	)	$	(76,353	)
Summary of Effective Income Tax Expense Reconciliation	'
	Income tax expense varies from the amount computed using the U.S. statutory rate. The reasons for this difference and the related tax effects are shown below:
		Fiscal Year
		2014			2013			2012
	Tax at U.S. statutory rate	$	109,519		$	112,391		$	115,434
	State tax provision, net of federal benefit		7,768			8,322			7,277
	Effect of foreign taxes		461			(4,603	)		(3,944	)
	Permanent differences		(4,843	)		(3,439	)		(702	)
	Other		(605	)		(1,826	)		(1,068	)
		$	112,300		$	110,845		$	116,997
Summary of Changes in Gross Amounts of Unrecognized Tax Benefits	'
	A summary of the changes in the gross amounts of unrecognized tax benefits for the years ended April 26, 2014 and April 27, 2013 are shown below:
		2014			2013
	Balances beginning of period	$	19,155		$	18,099
	Additions for tax positions related to the current year		2,801			2,568
	Additions for tax positions of prior years		1,372			1,638
	Reductions for tax positions of prior years		(893	)		(1,135	)
	Statute expirations		(2,655	)		(1,907	)
	Settlements		(93	)		(108	)
	Balance, end of period	$	19,687		$	19,155

Segment_and_Geographic_Data_Ta

Segment and Geographic Data (Tables)	12 Months Ended
	Apr. 26, 2014
Segment Reporting [Abstract]	'
Information about Reportable Segments	'
	The following table presents information about Patterson’s reportable segments:
		Fiscal Year
		2014		2013		2012
	Net sales
	Dental supply	$	2,382,096	$	2,379,970	$	2,287,875
	Rehabilitation supply		478,574		501,997		513,340
	Veterinary supply		1,203,045		755,245		734,446
	Consolidated net sales	$	4,063,715	$	3,637,212	$	3,535,661
	Operating income
	Dental supply	$	249,138	$	247,747	$	246,755
	Rehabilitation supply		46,763		65,027		72,442
	Veterinary supply		49,855		41,681		38,812
	Consolidated operating income	$	345,756	$	354,455	$	358,009
	Depreciation and amortization
	Dental supply	$	35,209	$	34,953	$	31,375
	Rehabilitation supply		7,540		7,683		7,472
	Veterinary supply		7,237		3,366		3,362
	Consolidated depreciation and amortization	$	49,986	$	46,002	$	42,209
	Total assets
	Dental supply	$	1,342,333	$	1,442,667	$	1,502,672
	Rehabilitation supply		876,211		881,323		883,287
	Veterinary supply		646,133		357,788		353,409
	Consolidated total assets	$	2,864,677	$	2,681,778	$	2,739,368
Sales Information by Product	'
	The following table presents sales information by product for Patterson and its reportable segments:
		Fiscal Year
		2014		2013		2012
	Consolidated
	Consumable and printed products	$	2,776,765	$	2,343,407	$	2,312,309
	Equipment and software		973,814		993,767		930,601
	Other		313,136		300,038		292,751
	Total	$	4,063,715	$	3,637,212	$	3,535,661
	Dental supply
	Consumable and printed products	$	1,289,652	$	1,273,222	$	1,263,515
	Equipment and software		828,858		843,880		768,633
	Other		263,586		262,868		255,727
	Total	$	2,382,096	$	2,379,970	$	2,287,875
	Rehabilitation supply
	Consumable and printed products	$	352,181	$	361,164	$	363,004
	Equipment and software		100,936		114,818		123,649
	Other		25,457		26,015		26,687
	Total	$	478,574	$	501,997	$	513,340
	Veterinary supply
	Consumable and printed products	$	1,134,932	$	709,021	$	685,790
	Equipment and software		44,020		35,069		38,319
	Other		24,093		11,155		10,337
	Total	$	1,203,045	$	755,245	$	734,446
Information by Geographical Area	'
	The following table presents information about Patterson by geographic area. No individual country, except for the United States, generated sales greater than 10% of consolidated net sales. There were no material sales between geographic areas.
		Fiscal Year
		2014		2013		2012
	Net sales
	United States	$	3,265,939	$	3,211,979	$	3,104,047
	International		797,776		425,233		431,614
	Total	$	4,063,715	$	3,637,212	$	3,535,661
	Income before tax
	United States	$	289,037	$	273,037	$	273,314
	International		23,875		48,080		56,498
	Total	$	312,912	$	321,117	$	329,812
	Long-lived assets
	United States	$	1,235,830	$	1,176,815	$	1,192,437
	International		213,130		143,627		143,418
	Total	$	1,448,960	$	1,320,442	$	1,335,855

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Apr. 26, 2014
Equity [Abstract]	'
Cash Dividends Declared and Paid	'
	The following table presents our declared and paid cash dividends per share on our common stock for the past three years. The dividend declared in the fourth quarter of fiscal 2013 was paid early in the subsequent quarter; all other dividends were declared and paid in the same period. Patterson expects to continue paying a quarterly cash dividend into the foreseeable future.
		Period
	Fiscal year	1		2		3		4
	2014	$	0.16	$	0.16	$	0.16	$	0.2
	2013	$	0.14	$	0.14	$	0.14	$	0.16
	2012	$	0.12	$	0.12	$	0.12	$	0.14

Stockbased_Compensation_Tables

Stock-based Compensation (Tables)	12 Months Ended
	Apr. 26, 2014
Summary of Weighted-Average Assumptions	'
	The fair value of stock options granted was estimated as of the grant date using a Black-Scholes option-pricing model with the following weighted average assumptions during fiscal years 2014, 2013 and 2012:
			April 26,			April 27,			April 28
			2014			2013			2012
	Expected dividend yield			1.8	%		1.6	%		1.5	%
	Expected stock price volatility			30	%		30.6	%		33	%
	Risk-free interest rate			1.5	%		1.4	%		2.5	%
	Expected life of options (years)			7.1			7.5			7.4
Summary of Stock Option Activity	'
	Following is a summary of stock option activity for all plans during fiscal years 2014, 2013 and 2012 (share amounts in thousands):
			Total Outstanding
			Number			Exercise			Intrinsic
			of			Price (a)			Value
			Options
	Balance as of April 30, 2011			1,273		$	29.82
	Granted			64			33.9
	Exercised			(232	)		24.11
	Canceled			(119	)		29.64
	Balance as of April 28, 2012			986		$	31.45
	Granted			56			34.1
	Exercised			(290	)		22.49
	Canceled			(31	)		33.79
	Balance as of April 27, 2013			721		$	35.03
	Granted			57			39.33
	Exercised			(345	)		35.73
	Canceled			(44	)		33.11
	Balance as of April 26, 2014			389		$	35.29		$	2,168
	Vested or expected to vest as of April 26, 2014			306		$	35.89		$	1,667
	Exercisable as of April 26, 2014			113		$	40.75		$	498
	(a)	Weighted-average exercise price
Summary of Non-Vested Restricted Stock Awards and Performance Unit Awards	'
	The following tables summarize information concerning non-vested restricted stock awards and performance unit awards for fiscal years 2014, 2013 and 2012:
			Restricted Stock Awards
			Shares			Weighted
						Average
						Grant-Date
						Fair Value
	Outstanding at April 30, 2011			1,111		$	29.22
	Granted			272			34.6
	Vested			(138	)		(25.45	)
	Forfeitures			(83	)		(29.25	)
	Outstanding at April 28, 2012			1,162		$	30.92
	Granted			314			34.1
	Vested			(192	)		(35.62	)
	Forfeitures			(127	)		(30.98	)
	Outstanding at April 27, 2013			1,157		$	31.82
	Granted			283			38.02
	Vested			(174	)		(38.76	)
	Forfeitures			(43	)		(31.91	)
	Outstanding at April 26, 2014			1,223		$	33.02
			Performance Unit Awards
			Shares			Weighted
						Average
						Grant-Date
						Fair Value
	Outstanding at April 30, 2011			102		$	35.41
	Forfeitures and cancellations			(6	)		(35.41	)
	Outstanding at April 28, 2012			96		$	35.41
	Granted			130			34.09
	Forfeitures and cancellations			(21	)		(34.09	)
	Outstanding at April 27, 2013			205		$	34.09
	Granted			124			38.05
	Forfeitures and cancellations			(2	)		(34.75	)
	Outstanding at April 26, 2014			327		$	35.59
Employee Stock Purchase Plan [Member]	'
Summary of Weighted-Average Assumptions	'
	The following table summarizes the weighted-average assumptions relating to the Stock Purchase Plan for fiscal years 2014, 2013 and 2012:
			2014			2013			2012
	Expected dividend yield			1.6	%		1.6	%		1.4	%
	Expected stock price volatility			31	%		31	%		31.3	%
	Risk-free interest rate			0.1	%		0.2	%		0.2	%
	Expected life of options (years)			0.5			0.5			0.5
Capital Accumulation Plan [Member]	'
Summary of Weighted-Average Assumptions	'
	The following table summarizes the weighted-average assumptions relating to the CAP Plan for fiscal years 2014, 2013 and 2012:
			2014			2013			2012
	Expected dividend yield			1.6	%		1.6	%		1.4	%
	Expected stock price volatility			31	%		31	%		31.3	%
	Risk-free interest rate			0.3	%		0.3	%		0.3	%
	Expected life of options (years)			1			1			1

Quarterly_Results_unaudited_Ta

Quarterly Results (unaudited) (Tables)	12 Months Ended
	Apr. 26, 2014
Quarterly Financial Information Disclosure [Abstract]	'
Summary of Quarterly Results	'
	The following table summarizes results for fiscal 2014 and 2013.
		Quarter Ended
		Apr. 26,		Jan. 25,		Oct. 27,		July 28,
		2014		2014		2013		2013
	Net sales	$	1,102,077	$	1,082,679	$	998,834	$	880,125
	Gross profit		315,868		311,461		289,431		281,518
	Operating income		92,601		96,651		75,223		81,281
	Net income		55,671		57,021		42,028		45,892
	Earnings per share – basic	$	0.56	$	0.56	$	0.42	$	0.45
	Earnings per share – diluted	$	0.55	$	0.56	$	0.41	$	0.45
		Quarter Ended
		Apr. 27,		Jan. 26,		Oct. 27,		July 28,
		2013		2013		2012		2012
	Net sales	$	964,933	$	915,861	$	867,193	$	889,225
	Gross profit		324,177		300,293		280,599		285,700
	Operating income		104,456		89,538		77,869		82,592
	Net income		63,562		53,630		45,542		47,538
	Earnings per share – basic	$	0.63	$	0.53	$	0.44	$	0.45
	Earnings per share – diluted	$	0.62	$	0.52	$	0.44	$	0.45

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
Share data in Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
	Segment
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Number of reportable segments	3	'	'
Maturity period of maximum (in days)	'90 days	'	'
Inventories valued at LIFO as % of total inventories	75.00%	83.00%	'
Accumulated LIFO reserve	$74,607,000	$70,415,000	'
Estimated fair value of reporting unit exceeding book value	6.00%	'	'
Asset impairment charges	0	0	0
Consolidated net sales, percentage	2.00%	'	'
Percentage of liability recorded	87.00%	'	'
Total advertising and promotional expenses	18,263,000	19,721,000	18,811,000
Deferred direct-marketing expenses included in prepaid and other current assets	$2,031,000	$1,845,000	'
Unvested restricted stock award	0	0	140
Stock Options [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Securities excluded from calculation of diluted earnings per share	39	362	520
Building [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives	'39 years	'	'
Computer Equipment [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives	'3 years	'	'
Communications and Data Processing [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives	'5 years	'	'
Office Furniture And Equipment [Member] | Minimum [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives	'5 years	'	'
Office Furniture And Equipment [Member] | Maximum [Member]	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Estimated useful lives	'10 years	'	'

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings Per Share (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Earnings Per Share [Abstract]	'	'	'
Denominator for basic earnings per share - weighted average shares	100,727	103,030	110,121
Effect of dilutive securities - stock options, restricted stock and stock purchase plans	916	777	725
Denominator for diluted earnings per share - adjusted weighted average shares	101,643	103,807	110,846

Cash_and_cash_equivalents_Cash

Cash and cash equivalents - Cash and cash equivalents (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
In Thousands, unless otherwise specified
Cash And Cash Equivalents [Abstract]	'	'	'	'
Cash on hand	$213,397	$222,609	'	'
Money market funds	51,511	282,619	'	'
Total	$264,908	$505,228	$573,781	$388,665

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Goodwill Balances and Related Activity by Business Segment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Aug. 16, 2013
Goodwill [Line Items]	'	'
Beginning Balance	$823,740	$23,374
Acquisition Activity	24,023	'
Other Activity	-3,330	'
Ending Balance	844,433	23,374
Dental supply [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	137,867	'
Acquisition Activity	649	'
Other Activity	-1,053	'
Ending Balance	137,463	'
Rehabilitation supply [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	549,020	'
Other Activity	-4,013	'
Ending Balance	545,007	'
Veterinary supply [Member]	'	'
Goodwill [Line Items]	'	'
Beginning Balance	136,853	'
Acquisition Activity	23,374	'
Other Activity	1,736	'
Ending Balance	$161,963	'

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Apr. 26, 2014
Goodwill And Intangible Assets Disclosure [Abstract]	'
Other intangibles acquired, fair value	$45,800
Weighted average useful life	'10 years
Distribution fee	100,000
Distribution agreement period	'10 years
Amortization of the distribution agreement fee record period	'10 years
Future amortization expense, 2015	25,315,000
Future amortization expense, 2016	26,275,000
Future amortization expense, 2017	28,231,000
Future amortization expense, 2018	13,391,000
Future amortization expense, 2019	$4,128,000

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Balances of Other Intangible Assets Excluding Goodwill (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'	'
Copyrights, trade names and trademarks	$76,464	$76,464
Distribution agreement, customer lists and other	286,365	235,781
Less: Accumulated amortization	-13,967	-115,589
Net amortized intangible assets	146,686	120,192
Total identifiable intangible assets, net	$223,150	$196,656

Acquisitions_and_Equity_Invest2

Acquisitions and Equity Investments - Acquisitions Completed (Detail)	12 Months Ended
	Apr. 26, 2014	Apr. 26, 2014	Apr. 27, 2013	Apr. 27, 2013	Apr. 28, 2012	Apr. 28, 2012	Apr. 28, 2012
	Mercer Mastery [Member]	National Veterinary Supply [Member]	Iowa Dental Supply [Member]	Universal Vaporizer Support [Member]	American Veterinarian Supply Corp [Member]	Surgical Synergies Pty Ltd [Member]	Orthoplast [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Acquisition by segment	'Dental supply	'Veterinary supply	'Dental supply	'Veterinary supply	'Veterinary supply	'Rehabilitation supply	'Rehabilitation supply

Acquisitions_Purchase_Price_Al

Acquisitions - Purchase Price Allocation of Acquired Assets, Liabilities, and Goodwill (Detail) (USD $)	Apr. 26, 2014	Aug. 16, 2013	Apr. 27, 2013
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'	'	'
Receivables	'	$113,037	'
Inventory	'	45,785	'
Prepaid expenses and other current assets	'	1,187	'
Property, plant and equipment	'	2,622	'
Goodwill	844,433	23,374	823,740
Identifiable intangibles	'	45,337	'
Accounts payable	'	-79,916	'
Others accrued liabilities	'	-8,733	'
Purchase price	'	$142,693	'

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (National Veterinary Services Limited (NVS) [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014
National Veterinary Services Limited (NVS) [Member]	'
Business Acquisition [Line Items]	'
Transaction costs related to the acquisition	$675
Acquisition contributed of net sales	$419,340

Property_and_Equipment_Schedul

Property and Equipment - Schedule of Property and Equipment (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]	'	'
Land	$14,925	$14,811
Buildings	129,360	127,364
Leasehold improvements	18,295	16,751
Furniture and equipment	152,899	139,261
Data processing equipment	109,580	98,117
Construction-in-progress	18,110	5,594
Property and equipment, Gross	443,169	401,898
Accumulated depreciation	-238,230	-209,878
Property and equipment, net	$204,939	$192,020

Customer_Financing_Additional_

Customer Financing - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012	Apr. 30, 2011
	Customer
Customer Financing [Line Items]	'	'	'	'
Maximum credit financed for equipment purchases for any one customer	$500	'	'	'
Number of customer financing contracts	2	'	'	'
Financing contracts sold under ASC 860	282,698	283,175	287,627	'
Current receivables of finance contracts not yet sold	63,236	64,272	'	'
Cash and cash equivalents	264,908	505,228	573,781	388,665
Unearned income	5,894	1,586	'	'
Finance contracts receivable sold and outstanding	496,906	'	'	'
Deferred purchase price	84,750	72,328	'	'
Bad debt write-offs, percentage, maximum	1.00%	'	'	'
The Bank of Tokyo-Mitsubishi UFJ, Ltd. [Member]	'	'	'	'
Customer Financing [Line Items]	'	'	'	'
Maximum holdback receivable	500,000	'	'	'
Fifth Third Bank [Member]	'	'	'	'
Customer Financing [Line Items]	'	'	'	'
Maximum holdback receivable	100,000	'	'	'
Unsettled Financing Arrangements [Member]	'	'	'	'
Customer Financing [Line Items]	'	'	'	'
Cash and cash equivalents	$28,152	$34,260	'	'
Minimum [Member] | The Bank of Tokyo-Mitsubishi UFJ, Ltd. [Member]	'	'	'	'
Customer Financing [Line Items]	'	'	'	'
Percentage of principal amount of financing contracts held as collateral	9.00%	'	'	'
Minimum [Member] | Fifth Third Bank [Member]	'	'	'	'
Customer Financing [Line Items]	'	'	'	'
Percentage of principal amount of financing contracts held as collateral	10.00%	'	'	'

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Mar. 31, 2008

Mar. 31, 2008

Apr. 26, 2014

Apr. 26, 2014

Apr. 27, 2013

Apr. 28, 2012

Apr. 26, 2014

Apr. 26, 2014

Dec. 31, 2011

Mar. 31, 2008

Mar. 31, 2008

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Mar. 31, 2008

Mar. 31, 2008

Agreement

Interest rate swap [Member]

Interest rate swap [Member]

Interest rate swap [Member]

Interest rate swap [Member]

Interest rate swap [Member]

Minimum [Member]

Maximum [Member]

Fixed-Rate Senior Notes [Member]

Fixed-Rate Senior Notes [Member]

Senior Notes 4.63% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Term Note Due Fiscal 2013 [Member]

Term Note Due Fiscal 2013 [Member]

Term Note Due Fiscal 2013 [Member]

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]

Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]

Interest rate swap [Member]

Interest rate swap [Member]

Minimum [Member]

Maximum [Member]

Reclassification out of Accumulated Other Comprehensive Income [Member]

Reclassification out of Accumulated Other Comprehensive Income [Member]

Reclassification out of Accumulated Other Comprehensive Income [Member]

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected future minimum principal payments in fiscal year 2015

$250,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected future minimum principal payments in fiscal year 2018

150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected future minimum principal payments in fiscal year 2019

60,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected future minimum principal payments in years thereafter

265,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate principal amount

'

'

'

'

'

'

'

'

'

'

'

325,000,000

450,000,000

50,000,000

250,000,000

250,000,000

250,000,000

'

150,000,000

150,000,000

150,000,000

'

60,000,000

60,000,000

60,000,000

165,000,000

165,000,000

165,000,000

100,000,000

100,000,000

100,000,000

'

'

'

Senior notes interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

4.63%

5.17%

5.17%

5.17%

5.17%

5.75%

5.75%

5.75%

5.75%

2.95%

2.95%

2.95%

3.59%

3.59%

3.59%

3.74%

3.74%

3.74%

'

'

'

Senior notes maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

'2013

'2015

'2015

'2015

'2015

'2018

'2018

'2018

'2018

'2019

'2019

'2019

'2022

'2022

'2022

'2024

'2024

'2024

'2013

'

'

Aggregate principal amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

75,000,000

'

'

Interest floating rate based on LIBOR

'

'

'

'

'

'

'

'

'

1.13%

1.88%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.50%

1.25%

Debt issuance costs

'

'

1,800,000

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional amounts of interest rate swap agreements

'

'

'

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in net of income taxes, to other comprehensive income

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Pre-tax amount reclassified into earnings

'

'

'

'

'

'

200,000

200,000

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount expected to be reclassified into earnings

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of agreements

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available revolving credit facility

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expiration date

31-Dec-16

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding borrowings

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Debt_Detail

Long-Term Debt - Debt (Detail) (USD $)

Apr. 26, 2014

Apr. 27, 2013

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

In Thousands, unless otherwise specified

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed rate senior notes due fiscal 2015 to 2024

'

'

$250,000

$250,000

$250,000

$150,000

$150,000

$150,000

$60,000

$60,000

$60,000

$165,000

$165,000

$165,000

$100,000

$100,000

$100,000

Total debt

725,000

725,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Less: current debt obligations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt

$725,000

$725,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Debt_Parenthetic

Long-Term Debt - Debt (Parenthetical) (Detail)

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Mar. 31, 2008

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Dec. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.17% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 5.75% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 2.95% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.59% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Senior Notes 3.74% [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed rate

5.17%

5.17%

5.17%

5.75%

5.75%

5.75%

2.95%

2.95%

2.95%

3.59%

3.59%

3.59%

3.74%

3.74%

3.74%

Senior notes maturity date

'2015

'2015

'2015

'2018

'2018

'2018

'2019

'2019

'2019

'2022

'2022

'2022

'2024

'2024

'2024

Derivative_Financial_Instrumen2

Derivative Financial Instruments - Additional Information (Detail) (USD $)	Apr. 27, 2013	Apr. 26, 2014	Apr. 26, 2014	Aug. 31, 2013	Apr. 26, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified	Interest Rate Swap Agreement [Member]	Interest Rate Cap [Member]	Interest Rate Cap [Member]	Interest Rate Cap [Member]	Interest rate swap [Member]	Interest Rate Swap Agreements [Member]
		Derivative	Replacement Agreement [Member]	Replacement Agreement [Member]	Derivative
Derivative [Line Items]	'	'	'	'	'	'
Notional amount of derivatives	$75,000	$500,000	'	$100,000	'	$250,000
Maturity date	'	'2022-02	'2021-01	'	'	'
Number of interest rate caps purchased by PDC Funding	'	1	'	'	'	'
Number of interest rate caps sold	'	1	'	'	'	'
Number of interest rate caps	'	'	'	'	1	'
Percentage of senior notes	'	'	'	'	'	5.17%
Senior Notes amount due	'	'	'	'	'	$250,000
Period of long term loan	'	'	'	'	'	'10 years

Derivative_Financial_Instrumen3

Derivative Financial Instruments - Fair Value of Interest Rate Contracts (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Interest rate contracts, assets, fair value	$1,716	$486
Interest rate contracts, liabilities, fair value	7,380	509
Other noncurrent assets [Member] | Interest rate contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Interest rate contracts, assets, fair value	1,716	486
Other noncurrent assets [Member] | Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Interest rate contracts, assets, fair value	'	'
Other noncurrent liabilities [Member] | Interest rate contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Interest rate contracts, liabilities, fair value	1,720	509
Other noncurrent liabilities [Member] | Interest rate swap [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Interest rate contracts, liabilities, fair value	$5,660	'

Derivative_Financial_Instrumen4

Derivative Financial Instruments - Effect of Interest Rate Contracts on Consolidated Statements of Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Interest rate contracts [Member] | Other income (expense), net [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Other income (expense), net and Other comprehensive Income	$4	$78	$2
Interest rate swap [Member] | Other comprehensive Income [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Other income (expense), net and Other comprehensive Income	$5,660	'	'

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash equivalents	$51,511	$282,619
Derivative instruments, assets	1,716	486
Total assets	53,227	283,105
Derivative instruments, liabilities	7,380	509
Quoted Prices in Active Markets (Level 1) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash equivalents	51,511	282,619
Derivative instruments, assets	'	'
Total assets	51,511	282,619
Derivative instruments, liabilities	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash equivalents	'	'
Derivative instruments, assets	1,716	486
Total assets	1,716	486
Derivative instruments, liabilities	7,380	509
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Cash equivalents	'	'
Derivative instruments, assets	'	'
Total assets	'	'
Derivative instruments, liabilities	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Estimated fair value of debt	$742,619	$774,606

Securities_Additional_Informat

Securities - Additional Information (Detail)	Apr. 26, 2014	Apr. 26, 2014	Apr. 27, 2013	Apr. 26, 2014	Apr. 26, 2014	Apr. 26, 2014
In Thousands, unless otherwise specified	USD ($)	CAD	USD ($)	Maximum [Member]	Maximum [Member]	Significant Unobservable Inputs (Level 3) [Member]
				Current Assets [Member]	Noncurrent Assets [Member]	USD ($)
Schedule of Held-to-maturity Securities [Line Items]	'	'	'	'	'	'
Total principal amount	'	110,000	'	'	'	'
Securities maturity period	'	'	'	'1 year	'2 years	'
Current asset	1,415,717	'	1,361,336	'	'	40,775
Noncurrent asset	'	'	'	'	'	$58,897

Lease_Commitments_Future_Minim

Lease Commitments - Future Minimum Rental Payments Under Non-cancelable Operating Leases (Detail) (USD $)	Apr. 26, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'
2015	$18,981
2016	15,875
2017	13,429
2018	10,557
2019	7,728
Thereafter	10,961
Total minimum payments required	$77,531

Lease_Commitments_Additional_I

Lease Commitments - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Commitments And Contingencies Disclosure [Abstract]	'	'	'
Rent expense	$21,290	$22,016	$20,819

Income_Taxes_Components_of_Pro

Income Taxes - Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Current, Federal	$84,353	$80,290	$89,612
Current, Foreign	9,667	13,471	16,726
Current, State	10,515	10,035	10,570
Total current	104,535	103,796	116,908
Deferred, Federal	7,501	6,667	872
Deferred, Foreign	-240	-963	-895
Deferred, State	504	1,345	112
Total deferred	7,765	7,049	89
Provision for income taxes	$112,300	$110,845	$116,997

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) (USD $)	Apr. 26, 2014	Apr. 27, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Capital accumulation plan	$5,893	$5,540
Inventory related items	5,512	8,170
Bad debt allowance	1,518	2,092
LIFO reserve	-16,279	-15,901
Other	13,447	17,075
Deferred net current income tax asset	10,091	16,976
Amortizable intangibles	-26,590	-27,934
Goodwill	-69,613	-62,911
Property, plant, equipment	-4,744	-5,390
Stock based compensation expense	8,130	9,603
Net operating loss carryforwards	6,848	8,070
Other	-4,276	-10,290
Deferred long-term income tax (liability) asset	-90,245	-88,852
Valuation allowance	-3,759	-4,477
Deferred net long-term income tax liability	-94,004	-93,329
Net deferred income tax liability	($83,913)	($76,353)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Foreign net operating loss carryforwards	$29,776	'	'
Deferred tax assets from net operating loss carryforwards	6,848	8,070	'
Undistributed earnings subject to federal income tax	254,540	'	'
Gross unrecognized tax benefits	19,687	19,155	18,099
Deferred tax assets, net	5,003	4,735	'
Interest and penalties	2,124	2,358	'
Increase in interest and penalties expense	$542	'	'

Income_Taxes_Summary_of_Effect

Income Taxes - Summary of Effective Income Tax Expense Reconciliation (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Income Tax Disclosure [Abstract]	'	'	'
Tax at U.S. statutory rate	$109,519	$112,391	$115,434
State tax provision, net of federal benefit	7,768	8,322	7,277
Effect of foreign taxes	461	-4,603	-3,944
Permanent differences	-4,843	-3,439	-702
Other	-605	-1,826	-1,068
Provision for income taxes	$112,300	$110,845	$116,997

Income_Taxes_Summary_of_Change

Income Taxes - Summary of Changes in Gross Amounts of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013
Income Tax Disclosure [Abstract]	'	'
Balances beginning of period	$19,155	$18,099
Additions for tax positions related to the current year	2,801	2,568
Additions for tax positions of prior years	1,372	1,638
Reductions for tax positions of prior years	-893	-1,135
Statute expirations	-2,655	-1,907
Settlements	-93	-108
Balance, end of period	$19,687	$19,155

Segment_and_Geographic_Data_Ad

Segment and Geographic Data - Additional Information (Detail)	12 Months Ended
	Apr. 26, 2014
	Segment
Segment Reporting [Abstract]	'
Number of reportable segments	3
Maximum percentage of sales generated by other than United States	10.00%

Segment_and_Geographic_Data_In

Segment and Geographic Data - Information about Reportable Segments (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$1,102,077	$1,082,679	$998,834	$880,125	$964,933	$915,861	$867,193	$889,225	$4,063,715	$3,637,212	$3,535,661
Operating income	92,601	96,651	75,223	81,281	104,456	89,538	77,869	82,592	345,756	354,455	358,009
Depreciation and amortization	'	'	'	'	'	'	'	'	49,986	46,002	42,209
Total assets	2,864,677	'	'	'	2,681,778	'	'	'	2,864,677	2,681,778	2,739,368
Dental supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	2,382,096	2,379,970	2,287,875
Operating income	'	'	'	'	'	'	'	'	249,138	247,747	246,755
Depreciation and amortization	'	'	'	'	'	'	'	'	35,209	34,953	31,375
Total assets	1,342,333	'	'	'	1,442,667	'	'	'	1,342,333	1,442,667	1,502,672
Rehabilitation supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	478,574	501,997	513,340
Operating income	'	'	'	'	'	'	'	'	46,763	65,027	72,442
Depreciation and amortization	'	'	'	'	'	'	'	'	7,540	7,683	7,472
Total assets	876,211	'	'	'	881,323	'	'	'	876,211	881,323	883,287
Veterinary supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	1,203,045	755,245	734,446
Operating income	'	'	'	'	'	'	'	'	49,855	41,681	38,812
Depreciation and amortization	'	'	'	'	'	'	'	'	7,237	3,366	3,362
Total assets	$646,133	'	'	'	$357,788	'	'	'	$646,133	$357,788	$353,409

Segment_and_Geographic_Data_Sa

Segment and Geographic Data - Sales Information by Product (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$1,102,077	$1,082,679	$998,834	$880,125	$964,933	$915,861	$867,193	$889,225	$4,063,715	$3,637,212	$3,535,661
Consumable and printed products [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	2,776,765	2,343,407	2,312,309
Equipment and software [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	973,814	993,767	930,601
Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	313,136	300,038	292,751
Dental supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	2,382,096	2,379,970	2,287,875
Dental supply [Member] | Consumable and printed products [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	1,289,652	1,273,222	1,263,515
Dental supply [Member] | Equipment and software [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	828,858	843,880	768,633
Dental supply [Member] | Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	263,586	262,868	255,727
Rehabilitation supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	478,574	501,997	513,340
Rehabilitation supply [Member] | Consumable and printed products [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	352,181	361,164	363,004
Rehabilitation supply [Member] | Equipment and software [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	100,936	114,818	123,649
Rehabilitation supply [Member] | Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	25,457	26,015	26,687
Veterinary supply [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	1,203,045	755,245	734,446
Veterinary supply [Member] | Consumable and printed products [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	1,134,932	709,021	685,790
Veterinary supply [Member] | Equipment and software [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	44,020	35,069	38,319
Veterinary supply [Member] | Other [Member]	'	'	'	'	'	'	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	$24,093	$11,155	$10,337

Segment_and_Geographic_Data_In1

Segment and Geographic Data - Information by Geographic Area (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$1,102,077	$1,082,679	$998,834	$880,125	$964,933	$915,861	$867,193	$889,225	$4,063,715	$3,637,212	$3,535,661
Income before tax	'	'	'	'	'	'	'	'	312,912	321,117	329,812
Long-lived assets	1,448,960	'	'	'	1,320,442	'	'	'	1,448,960	1,320,442	1,335,855
United States	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	3,265,939	3,211,979	3,104,047
Income before tax	'	'	'	'	'	'	'	'	289,037	273,037	273,314
Long-lived assets	1,235,830	'	'	'	1,176,815	'	'	'	1,235,830	1,176,815	1,192,437
International [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net sales	'	'	'	'	'	'	'	'	797,776	425,233	431,614
Income before tax	'	'	'	'	'	'	'	'	23,875	48,080	56,498
Long-lived assets	$213,130	'	'	'	$143,627	'	'	'	$213,130	$143,627	$143,418

Stockholders_Equity_Cash_Divid

Stockholders' Equity - Cash Dividends Declared and Paid (Detail) (USD $)

3 Months Ended

Apr. 26, 2014

Jan. 25, 2014

Oct. 26, 2013

Jul. 27, 2013

Apr. 27, 2013

Jan. 26, 2013

Oct. 27, 2012

Jul. 28, 2012

Apr. 28, 2012

Jan. 28, 2012

Oct. 29, 2011

Jul. 30, 2011

Equity [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Cash dividend paid

$0.20

$0.16

$0.16

$0.16

$0.16

$0.14

$0.14

$0.14

$0.14

$0.12

$0.12

$0.12

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

1 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Mar. 31, 2011

Apr. 26, 2014

Apr. 27, 2013

Apr. 28, 2012

Mar. 19, 2013

Dec. 31, 2007

Apr. 26, 2014

Apr. 26, 2014

Apr. 26, 2014

Apr. 26, 2014

Apr. 27, 2013

Apr. 30, 2012

Apr. 26, 2014

Apr. 30, 2011

Apr. 26, 2014

Apr. 28, 2012

Apr. 27, 2013

Minimum [Member]

Maximum [Member]

Unearned ESOP Shares [Member]

Thompson Dental Company [Member]

Thompson Dental Company [Member]

Thompson Dental Company [Member]

1990 Note [Member]

1990 Note [Member]

2006 Senior Notes [Member]

2006 Senior Notes [Member]

2006 Senior Notes [Member]

Shareholders Equity [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock repurchased and retired, shares

'

2,354,000

5,224,017

11,954,257

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock repurchased and retired, value

'

$96,486,000

$181,756,000

$361,047,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Average cost of common shares repurchased and retired

'

$40.99

$34.79

$30.20

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares authorized for repurchase under share repurchase program

'

'

'

'

25,000,000

25,000,000

'

'

'

'

'

'

'

'

'

'

'

Remaining shares available under repurchase program

'

22,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares repurchase under share repurchase program

20,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional shares authorized for New repurchase under share repurchase program

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock repurchase program, expiration date

15-Mar-16

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

ESOP company loan

'

'

'

'

'

'

'

'

'

'

'

'

22,000,000

'

105,000,000

'

'

Hours of service completed in order to be allocated shares of stock acquired by plan

'

'1000 hours

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares secured with an aggregate cost

'

'

'

'

'

'

'

'

'

373,000

363,000

298,000

'

1,635,000

10,959,000

'

20,214,000

Additional loan to ESOP

'

'

'

'

'

'

'

'

'

12,612,000

'

'

'

'

'

'

'

ESOP acquiring shares during acquisition

'

'

'

'

'

'

'

'

'

665,978

'

'

'

'

3,159,645

844,325

'

Interest due from ESOP

'

'

'

'

'

'

'

'

'

200,000

'

'

'

'

'

'

'

Total shares allocated to ESOP

'

'

'

'

'

'

'

'

'

97,810

'

'

'

'

'

'

'

Remaining shares in ESOP

'

'

'

'

'

'

'

'

'

568,168

'

'

'

'

'

'

'

Contributed to ESOP

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

23,639

'

Number of shares allocated to ESOP

'

13,851,147

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of shares allocated to ESOP, Fair value

'

566,650,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Committed-to-be-released shares

'

'

'

'

'

'

'

'

'

9,197

'

'

'

'

270,117

'

'

Suspense shares

'

'

'

'

'

'

'

'

'

454,092

'

'

'

'

2,282,877

'

'

Unearned shares held by ESOP to occur over a period

'

'

'

'

'

'

'5 years

'10 years

'

'

'

'

'

'

'

'

'

Fair value of unearned shares by ESOP

'

$85,944,000

$95,124,000

'

'

'

'

'

$111,969,000

'

'

'

'

'

'

'

'

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expense recognized	'	$8,686	$14,625	$12,615
After-tax stock-based compensation expense	'	5,896	9,452	8,441
Excess benefits	'	1,290	2,487	1,371
Compensation cost before income taxes related to non-vested awards yet to be recognized	'	29,400	'	'
Total compensation cost expected to be recognized over a weighted average period	'	'5 years 1 month 6 days	'	'
Expected dividend yield	'	0.00%	'	'
Weighted average fair values of options granted	'	$11.02	$10.15	$11.47
Weighted average remaining contractual lives of options outstanding	'	'4 years 3 months 18 days	'	'
Weighted average remaining contractual lives of options exercisable	'	'2 years 6 months	'	'
Stock options exercised, intrinsic value	'	1,722	3,397	1,731
Stock options exercised, cash received	'	12,309	6,518	5,604
Stock options exercised, tax benefits realized	'	1,273	641	442
Stock Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expense recognized	'	768	1,175	1,553
Director Stock Option Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'1 year	'	'
Exercisable period	'	'4 years	'	'
New Director Stock Option Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'1 year	'	'
Exercisable period	'	'9 years	'	'
Shares of common stock reserved for issuance	'	800,000	'	'
Patterson Dental Company 1992 Stock Option Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Shares of common stock reserved for issuance	'	6,000,000	'	'
Equity Incentive Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'10 years	'	'
Restricted Stock and Restricted Stock Units [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Minimum restriction period for restricted stock and restricted stock units	'	'3 years	'	'
Performance Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'3 years	'	'
Minimum restriction period for performance based awards	'	'1 year	'	'
After Amendment [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Increase in the maximum number of shares that may be issued pursuant to awards of restricted stock, restricted stock awards and stock bonuses	'	2,000,000	'	'
Before amendment [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Increase in the maximum number of shares that may be issued pursuant to awards of restricted stock, restricted stock awards and stock bonuses	'	6,000,000	'	'
Restricted Stock Units And Performance Stock Unit Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expense recognized	'	4,793	10,255	7,962
Vesting period	'	'3 years	'	'
Total intrinsic value of restricted stock awards vested in period	'	6,831	6,923	4,559
Restricted Stock Units And Performance Stock Unit Awards [Member] | Scenario 1 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'5 years	'	'
Restricted Stock Units And Performance Stock Unit Awards [Member] | Scenario 2 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'7 years	'	'
Restricted Stock Units And Performance Stock Unit Awards [Member] | Scenario 3 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'9 years	'	'
Restricted Stock Units And Performance Stock Unit Awards [Member] | Management [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period	'	'3 years	'	'
Employee Stock Purchase Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expense recognized	'	1,838	1,816	1,772
Expected dividend yield	'	1.60%	1.60%	1.40%
Shares of common stock reserved for issuance	'	4,750,000	'	'
Number of months required for eligibility to participate in plan	'	'Employees are eligible to participate after nine months of employment, if they are employed for at least 20 hours per week and more than five months per year.	'	'
Common stock purchases represented as percentage of employee's compensation	'	10.00%	'	'
Percentage of fair market value of the common stock	'	85.00%	'	'
Number of shares available for purchase under stock plan	'	1,733,271	'	'
Shares issued under stock plan	6,750,000	'	'	'
Capital Accumulation Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Expense recognized	'	$1,287	$1,379	$1,327
Expected dividend yield	'	1.60%	1.60%	1.40%
Percentage of fair market value of the common stock	'	75.00%	'	'
Number of shares available for purchase under stock plan	'	2,128,497	'	'
Common stock purchases represented as percentage of employee's compensation, minimum	'	5.00%	'	'
Common stock purchases represented as percentage of employee's compensation, maximum	'	25.00%	'	'

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Weighted-Average Assumptions (Detail)	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	0.00%	'	'
Capital Accumulation Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	1.60%	1.60%	1.40%
Expected stock price volatility	31.00%	31.00%	31.30%
Risk-free interest rate	0.30%	0.30%	0.30%
Expected life of options (years)	'1 year	'1 year	'1 year
Director and Employee Stock Option Plans [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	1.80%	1.60%	1.50%
Expected stock price volatility	30.00%	30.60%	33.00%
Risk-free interest rate	1.50%	1.40%	2.50%
Expected life of options (years)	'7 years 1 month 6 days	'7 years 6 months	'7 years 4 months 24 days
Employee Stock Purchase Plan [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected dividend yield	1.60%	1.60%	1.40%
Expected stock price volatility	31.00%	31.00%	31.30%
Risk-free interest rate	0.10%	0.20%	0.20%
Expected life of options (years)	'6 months	'6 months	'6 months

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Apr. 26, 2014		Apr. 27, 2013		Apr. 28, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'		'		'
Number of Options, Beginning balance	721		986		1,273
Number of Options, Granted	57		56		64
Number of Options, Exercised	-345		-290		-232
Number of Options, Canceled	-44		-31		-119
Number of Options, Ending balance	389		721		986
Exercise Price, Beginning balance	$35.03	[1]	$31.45	[1]	$29.82	[1]
Number of Options, Vested or expected to vest at end of year	306		'		'
Exercise Price, Granted	$39.33	[1]	$34.10	[1]	$33.90	[1]
Number of Options, Exercisable at end of year	113		'		'
Exercise Price, Exercised	$35.73	[1]	$22.49	[1]	$24.11	[1]
Exercise Price, Canceled	$33.11	[1]	$33.79	[1]	$29.64	[1]
Exercise Price, Ending balance	$35.29	[1]	$35.03	[1]	$31.45	[1]
Exercise Price, Vested or expected to vest at end of year	$35.89	[1]	'		'
Exercise Price, Exercisable at end of year	$40.75	[1]	'		'
Intrinsic Value, Balance at end of year	$2,168		'		'
Intrinsic Value, Vested or expected to vest at end of year	1,667		'		'
Intrinsic Value, Exercisable at end of year	$498		'		'
[1]	Weighted-average exercise price

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Non-Vested Restricted Stock Awards and Performance Unit Awards (Detail) (USD $)	12 Months Ended
	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Restricted Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares Outstanding, Beginning balance	1,157	1,162	1,111
Shares, Granted	283	314	272
Shares, Vested	-174	-192	-138
Shares, Forfeitures and cancellations	-43	-127	-83
Shares Outstanding, Ending balance	1,223	1,157	1,162
Weighted Average Grant-Date Fair Value, Beginning balance	$31.82	$30.92	$29.22
Weighted Average Grant-Date Fair Value, Granted	$38.02	$34.10	$34.60
Weighted Average Grant-Date Fair Value, Vested	($38.76)	($35.62)	($25.45)
Weighted Average Grant-Date Fair Value, Forfeitures	($31.91)	($30.98)	($29.25)
Weighted Average Grant-Date Fair Value, Ending balance	$33.02	$31.82	$30.92
Performance Unit Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares Outstanding, Beginning balance	205	96	102
Shares, Granted	124	130	'
Shares, Forfeitures and cancellations	-2	-21	-6
Shares Outstanding, Ending balance	327	205	96
Weighted Average Grant-Date Fair Value, Beginning balance	$34.09	$35.41	$35.41
Weighted Average Grant-Date Fair Value, Granted	$38.05	$34.09	'
Weighted Average Grant-Date Fair Value, Forfeitures	($34.75)	($34.09)	($35.41)
Weighted Average Grant-Date Fair Value, Ending balance	$35.59	$34.09	$35.41

Quarterly_Results_Unaudited_Su

Quarterly Results (Unaudited) - Summary of Quarterly Results (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 26, 2014	Jan. 25, 2014	Oct. 26, 2013	Jul. 27, 2013	Apr. 27, 2013	Jan. 26, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net sales	$1,102,077	$1,082,679	$998,834	$880,125	$964,933	$915,861	$867,193	$889,225	$4,063,715	$3,637,212	$3,535,661
Gross profit	315,868	311,461	289,431	281,518	324,177	300,293	280,599	285,700	1,198,278	1,190,769	1,162,514
Operating income	92,601	96,651	75,223	81,281	104,456	89,538	77,869	82,592	345,756	354,455	358,009
Net income	$55,671	$57,021	$42,028	$45,892	$63,562	$53,630	$45,542	$47,538	$200,612	$210,272	$212,815
Earnings per share - basic	$0.56	$0.56	$0.42	$0.45	$0.63	$0.53	$0.44	$0.45	$1.99	$2.04	$1.93
Earnings per share - diluted	$0.55	$0.56	$0.41	$0.45	$0.62	$0.52	$0.44	$0.45	$1.97	$2.03	$1.92

Recovered_Sheet1

Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Apr. 26, 2014	Apr. 27, 2013	Apr. 28, 2012
Allowance for doubtful accounts [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	$5,808	$7,831	$8,365
Charged to Costs and Expenses	3,220	1,119	2,445
Charged to Other Accounts	3,552	'	'
Deductions	2,707	3,142	2,979
Balance at End of Period	9,873	5,808	7,831
LIFO inventory adjustment [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	70,415	66,807	61,385
Charged to Costs and Expenses	4,192	3,607	5,422
Charged to Other Accounts	'	'	'
Deductions	'	'	'
Balance at End of Period	74,607	70,415	66,807
Inventory obsolescence reserve [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	6,333	5,456	5,844
Charged to Costs and Expenses	14,846	10,863	11,508
Charged to Other Accounts	391	'	'
Deductions	12,907	9,986	11,896
Balance at End of Period	8,663	6,333	5,456
Total inventory reserve [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	76,748	72,263	67,229
Charged to Costs and Expenses	19,038	14,471	16,930
Charged to Other Accounts	391	'	'
Deductions	12,907	9,986	11,896
Balance at End of Period	$83,270	$76,748	$72,263