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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 18, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Sep. 01, 2018 | Sep. 01, 2018 | Sep. 02, 2017 | Sep. 03, 2016
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Purchase of treasury stock |  |  |  |  |  | $ 25,432 | $ 48,869 | $ 384,111
Cost of repurchase, per share |  |  |  | $ 82.64 |  |  |  |
Shares purchased by qualified associates |  |  |  | 45,000 |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 5,000,000 | 5,000,000 | 5,000,000 |
Preferred stock, shares issued |  |  |  |  | 0 | 0 | 0 |
Preferred stock, shares outstanding |  |  |  |  | 0 | 0 | 0 |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Dividends declared date | Oct. 18, 2018 |  |  |  |  |  |  |
Dividends payable per share | $ 0.63 |  |  |  |  |  |  |
Dividend payable date | Nov. 27, 2018 |  |  |  |  |  |  |
Dividends record date | Nov. 13, 2018 |  |  |  |  |  |  |
Dividend payable amount | $ 35,400,000 |  |  |  |  |  |  |
Cost of repurchase, per share |  | $ 81.22 | $ 85.00 |  |  |  |  |
Subsequent Event [Member] | Purchases From Class B Holders [Member] |  |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Cost of repurchase, per share |  | $ 85.00 | $ 84.29 |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock shares repurchased |  |  |  |  | 45,000 |  |  |
Cost of repurchase, per share |  |  |  |  | $ 82.64 |  |  |
Class A Common Stock [Member] | Purchases From Class B Holders [Member] |  |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Cost of repurchase, per share |  |  |  |  |  |  |  | $ 72.50
Class A Treasury Stock [Member] |  |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock shares repurchased |  |  |  |  |  | 292,000 | 685,000 | 5,344,000
Purchase of treasury stock |  |  |  |  |  | $ 25,432 | $ 48,869 | $ 384,111
Cost of share repurchase |  |  |  |  |  |  |  | $ (362,153)
Treasury stock repurchased, and treasury stock repurchased and retired, shares |  |  |  |  |  | 972,000 |  |
Treasury stock repurchased, and treasury stock repurchased and retired, amount |  |  |  |  |  | $ 82,369 |  |
Retirement of treasury stock, Shares |  |  |  |  |  |  |  | 4,973,000
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation |  |  |  |  |  | 54,000 | 43,000 |
Number of shares authorized for repurchase |  |  |  |  | 5,000,000 | 5,000,000 |  |
Maximum number of shares that can be repurchased |  |  |  |  | 1,930,000 | 1,930,000 |  |
Treasury stock reissued to fund plan. shares |  |  |  |  |  | 57,000 |  |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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