Goodwill and Intangibles - Schedule of Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Nov. 22, 2014
Goodwill [Line Items]
Goodwill, Beginning balance	$ 367,829us-gaap_Goodwill
Goodwill added through acquisition	16,088us-gaap_GoodwillAcquiredDuringPeriod
Goodwill adjustments	0us-gaap_GoodwillPeriodIncreaseDecrease
Goodwill, Ending balance	383,917us-gaap_Goodwill
Auto Parts Stores [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	302,645
Goodwill added through acquisition	16,088
Goodwill adjustments	0
Goodwill, Ending balance	318,733
Other [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	65,184
Goodwill added through acquisition	0
Goodwill adjustments	0
Goodwill, Ending balance	$ 65,184

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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+ References

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