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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 24, 2017 | Aug. 19, 2016 | Aug. 31, 2016 | Sep. 02, 2017 | Sep. 03, 2016 | Aug. 29, 2015 | Jul. 31, 2016
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock shares repurchased |  |  | 4,973,000 |  |  |  |
Share Price |  |  | $ 72.50 |  |  |  |
Purchase of treasury stock |  |  | $ 360,566 | $ 48,869 | $ 384,111 | $ 33,414 |
Preferred stock, shares authorized |  |  |  | 5,000,000 | 5,000,000 |  |
Preferred stock, shares issued |  |  |  | 0 | 0 |  |
Preferred stock, shares outstanding |  |  |  | 0 | 0 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Dividends declared date | Oct. 24, 2017 |  |  |  |  |  |
Dividends payable per share | $ 0.48 |  |  |  |  |  |
Dividend payable date | Nov. 28, 2017 |  |  |  |  |  |
Dividends record date | Nov. 14, 2017 |  |  |  |  |  |
Dividend payable amount | $ 27,068,000 |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Stock repurchase, fees and expenses |  |  |  | $ 1,587 |  |  |
Cost of repurchase, per share |  |  |  | $ 72.82 |  |  |
Retirement of treasury stock, Shares |  |  |  | 4,973,000 |  |  |
Class A common stock shares repurchase amount, per share |  |  |  | $ 72.82 |  |  |
Class A Common Stock [Member] | Tender Offer [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock shares repurchased |  |  | 3,821,000 |  |  |  |
Share Price |  |  | $ 72.50 |  |  |  |
Authorized amount of repurchase |  |  |  |  |  |  | $ 300
Class A Common Stock [Member] | Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  | $ 66.00
Class A Common Stock [Member] | Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Share Price |  |  |  |  |  |  | $ 72.50
Class A Common Stock [Member] | Purchases From Class B Holders [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock shares repurchased |  | 1,152,000 |  |  |  |  |
Share Price |  | $ 72.50 |  |  |  |  |
Class A Treasury Stock [Member] |  |  |  |  |  |  |
Components Of Shareholders Equity [Line Items] |  |  |  |  |  |  |
Common stock shares repurchased |  |  |  | 685,000 | 5,344,000 | 444,000 |
Purchase of treasury stock |  |  |  | $ 48,869 | $ 384,111 | $ 33,414 |
Cost of share repurchase |  |  |  |  | $ (362,153) |  |
Retirement of treasury stock, Shares |  |  |  |  | 4,973,000 |  |
Shares repurchased by the company for associates' tax withholding liability associated with share-based compensation |  |  |  | 43,000 | 72,000 |  |
Maximum number of shares that can be repurchased |  |  |  | 802,000 |  |  |
Number of shares authorized for repurchase |  |  |  | 5,000,000 |  |  |
Treasury stock reissued to fund plan. shares |  |  |  | 57,000 | 64,000 |  |

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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