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Percentage Of Liability Recorded.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of expense for amortization of capitalized computer software costs.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended				12 Months Ended
	Apr. 30, 2022 USD ($)	Apr. 24, 2021 USD ($)	Jul. 25, 2020 USD ($)	Apr. 25, 2020 USD ($)	Apr. 30, 2022 USD ($) Segment reportingUnit	Apr. 24, 2021 USD ($)	Apr. 25, 2020 USD ($)
Accounting Policies [Abstract]
Number of reportable segments \| Segment					3
Maturity period of maximum (in days)					90 days
Inventories valued at LIFO as % of total inventories	85.00%	83.00%			85.00%	83.00%
Inventory, LIFO reserve	$ 130,959,000	$ 120,775,000			$ 130,959,000	$ 120,775,000
Property, Plant and Equipment [Line Items]
Number of reporting units \| reportingUnit					2
Goodwill impairment	0	0			$ 0	0	$ 675,055,000
Indefinite-lived intangible assets, impairment	0	0		$ 0
Amortization expense					7,267,000	2,346,000	0
Contract assets	134,000	2,491,000			134,000	2,491,000
Contract liabilities	38,581,000	23,526,000			38,581,000	23,526,000
Contract liability, revenue recognized					$ 20,658,000
Liability for percentage of maximum potential amount that could be redeemed					88.00%
Advertising expense					$ 1,532,000	$ 134,000	$ 5,793,000
Animal Health
Property, Plant and Equipment [Line Items]
Goodwill impairment	$ 269,000,000	$ 675,055,000	$ 406,055,000
Dental
Property, Plant and Equipment [Line Items]
Goodwill impairment				$ 0
Building
Property, Plant and Equipment [Line Items]
Estimated useful lives					39 years
Computer Hardware And Software \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives					3 years
Computer Hardware And Software \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives					10 years
Office Furniture And Equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives					5 years
Office Furniture And Equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives					10 years