Share-Based Compensation - 2012 Incentive Plan (Details) - 2012 Incentive Plan - USD ($) $ / shares in Units, $ in Thousands		4 Months Ended		9 Months Ended		12 Months Ended
	Nov. 15, 2012	Oct. 07, 2018	Oct. 08, 2017	Oct. 07, 2018	Oct. 08, 2017	Dec. 31, 2017
Share-Based Compensation
Maximum equity-based incentive awards (in shares)	11,400,000
New awards available for grant	0
Time-Based Options
Shares
Outstanding at the beginning of the period (in shares)				4,482,570
Exercised (in shares)				(110,922)
Expired (in shares)				(67,260)
Outstanding at the end of the period (in shares)		4,304,388		4,304,388		4,482,570
Exercisable at the end of the period (in shares)		4,304,388		4,304,388
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 6.58
Exercised (in dollars per share)				5.27
Expired (in dollars per share)				6.59
Outstanding at the end of the period (in dollars per share)		$ 6.62		6.62		$ 6.58
Exercisable at the end of the period (in dollars per share)		$ 6.62		$ 6.62
Weighted-Average Remaining Contractual Term, Outstanding				4 years 3 months 29 days		5 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable				4 years 3 months 29 days
Aggregate Intrinsic Value, Exercised						$ 8,809
Additional disclosures
Share-based compensation expense recognized (in dollars)		$ 0	$ 300	$ 100	$ 600
Unrecognized compensation cost		$ 0		$ 0
Option shares
Shares
Outstanding at the beginning of the period (in shares)				1,127,920
Granted (in shares)	3,625,580
Exercised (in shares)				(524,466)
Outstanding at the end of the period (in shares)		603,454		603,454		1,127,920
Exercisable at the end of the period (in shares)		603,454		603,454
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 2.50
Exercised (in dollars per share)				2.48
Outstanding at the end of the period (in dollars per share)		$ 2.51		2.51		$ 2.50
Exercisable at the end of the period (in dollars per share)		$ 2.51		$ 2.51
Weighted-Average Remaining Contractual Term, Outstanding				3 months		11 months 27 days
Weighted-Average Remaining Contractual Term, Exercisable				3 months
Additional disclosures
Period of repurchase rights in event of termination for cause or discovery of detrimental activity				180 days
Period of repurchase rights in event of termination other than for cause or discovery of detrimental activity				90 days