Number of installment.

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Number of warrant exercised.

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Warrants grant date fair value recognized as additional paid in capital.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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COVID-19 Pandemic - Additional Information (Details) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	Jul. 30, 2020 USD ($) shares	Jun. 29, 2020 USD ($)	Jun. 01, 2020 USD ($)	May 29, 2020 USD ($) Installment	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Operating Revenue					$ 825,253	$ 663,918	$ 1,468,755	$ 1,343,601
Payroll Support Program Agreement [Member] \| Grant [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Operating Revenue					$ 20,200		$ 20,200
Payroll Support Program Agreement [Member] \| US Treasury [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of installment \| Installment				3
Payroll support funding				$ 406,800
Number of warrants issued to acquire common stock \| shares					447,180		447,180
Exercise price of warrants exercisable \| $ / shares					$ 31.95		$ 31.95
Warrants grant date fair value recognized as additional paid in capital					$ 9,200		$ 9,200
Number of warrant exercised \| shares					0		0
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Commercial Paper
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from line of credit							$ 142,900
Interest on outstanding principal amount until fifth anniversary				1.00%
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Commercial Paper \| SOFR [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Percentage of additional bears interest after fifth anniversary				2.00%
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Subsequent Event [Member] \| Maximum [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of warrants issued to acquire common stock \| shares	625,452
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Subsequent Event [Member] \| Commercial Paper
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Proceeds from line of credit	$ 199,800
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| First Installment on June 1, 2020 [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payroll support funding received			$ 203,400
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Second Installment on June 29, 2020 [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payroll support funding received		$ 101,700
Payroll Support Program Agreement [Member] \| US Treasury [Member] \| Third Installment on July 30, 2020 [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Payroll support funding received	$ 101,700