Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended						9 Months Ended		12 Months Ended
	Mar. 20, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares	Aug. 25, 2019 USD ($) region $ / shares shares	May 26, 2019 USD ($)	Feb. 24, 2019 USD ($)	Aug. 26, 2018 USD ($)	May 27, 2018 USD ($)	Feb. 25, 2018 USD ($)	Aug. 25, 2019 USD ($) region $ / shares shares	Aug. 26, 2018 USD ($)	Nov. 25, 2018 USD ($) $ / shares shares	Feb. 12, 2019 vote class $ / shares shares	Feb. 11, 2019 $ / shares shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of geographical regions | region			3						3
Common stock, par value | $ / shares												$ 0.001	$ 0.01
Selling, general and administrative expenses			$ 595,528			$ 582,146			$ 1,814,949	$ 1,738,943
Reclassification to temporary equity				$ 322,985	$ (23,845)	(34,822)	$ (30,234)	$ (32,999)
Net periodic benefit cost			4,868			1,744			14,647	5,211
Accounting Standards Update 2017-07 [Member] | Other Income (Expense), Net [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit cost			$ 4,000			800			$ 12,000	$ 2,400	$ 3,400
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification to temporary equity				$ 351,185	$ (506)	$ 7,230	$ (2,438)	$ 9,590
IPO [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of classes of common stock | class												2
IPO [Member] | Accrued Salaries, Wages and Employee Benefits [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock-based compensation expense	$ 45,800
IPO [Member] | Other Noncurrent Liabilities [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock-based compensation expense	$ 10,300
Common Class A [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par value | $ / shares			$ 0.001						$ 0.001		$ 0.001
Increase amount (in shares) | shares													930,000,000
Common stock, shares authorized | shares			1,200,000,000						1,200,000,000		1,200,000,000	1,200,000,000
Common Class A [Member] | 2019 Equity Incentive Plan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of shares authorized under plan | shares												40,000,000
Common Class A [Member] | 2019 Employee Stock Purchase Plan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of shares authorized under plan | shares												12,000,000
Common Class A [Member] | IPO [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par value | $ / shares												$ 0.001
Shares issued and sold (in shares) | shares		14,960,557
Shares issued and sold (usd per share) | $ / shares		$ 17.00
Net proceeds		$ 234,600
Underwriting discounts and commissions paid		13,600
Underwriting discounts and commissions paid on behalf of selling stockholders		24,900
Offering expenses		6,100
Selling, general and administrative expenses		$ 3,500
Number of votes per share of common stock | vote												1
Common Class B [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par value | $ / shares			$ 0.001						$ 0.001		$ 0.001
Common stock, shares authorized | shares			422,000,000						422,000,000		422,000,000
Common Class B [Member] | IPO [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par value | $ / shares												$ 0.001
Number of votes per share of common stock | vote												10