Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Stockholders' Equity / (Deficit) - Share Repurchase Program (Details) $ in Thousands, shares in Millions		9 Months Ended
	May 14, 2018 shares	Sep. 30, 2018 USD ($)	Sep. 24, 2017 USD ($)	Oct. 09, 2018	Mar. 01, 2018 USD ($)
Share repurchase program
Cash payment for repurchase of common stock		$ 158,049	$ 121,705
Subsequent event \| Maximum \| Amendment to Credit Agreement \| Ability to make dividends and distributions based on Leverage Ratio
Share repurchase program
Leverage Ratio				3.75
Common stock repurchase program
Share repurchase program
Stock repurchase program, authorized amount		2,075,000
Stock repurchase program, remaining authorized amount		$ 269,700
ASR Agreement
Share repurchase program
Stock repurchase program, authorized amount					$ 100,000
Stock repurchased during period, shares \| shares	1.7