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Debt And Capital Lease Obligations (Credit Facility) (Narrative) (Details) $ in Thousands | 12 Months Ended
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Sep. 01, 2018 USD ($) | Sep. 02, 2017 USD ($) | Sep. 03, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Maximum consolidated leverage ratio of total indebtedness to EBITDA | 3.00 |  |
Minimum consolidated interest coverage ratio of EBITDA to total interest expense | 3.00 |  |
Borrowings under Credit Facility | $ 242,000 | $ 546,000 | $ 305,000
Repayments of debt | 350,000 | $ 618,500 | $ 301,000
New Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 600,000 |  |
Maturity date | Apr. 14, 2022 |  |
Credit facility, expiration term | 5 years |  |
Available increase in amount borrowed | $ 300,000 |  |
Borrowing rate under Credit Facility | 3.20% |  |
Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, maximum borrowing capacity | $ 50,000 |  |
LIBOR [Member] | New Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage points in addition to reference rate used in computation of variable rate on debt instrument | 1.125% |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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