Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended
Nov. 07, 2018	Dec. 29, 2018
Canyon Bakehouse LLC \| Subsequent Event
Subsequent Event [Line Items]
Business acquistition, consideration transferred	$ 205.0
Business acquisition, performance-based contingent payment	$ 5.0
Minimum \| Scenario, Forecast \| Bakery Closing \| Brattleboro, Vermont
Subsequent Event [Line Items]
Estimated closure costs		$ 5.0
Maximum \| Scenario, Forecast \| Bakery Closing \| Brattleboro, Vermont
Subsequent Event [Line Items]
Estimated closure costs		$ 6.0

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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