Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 29, 2015	Jun. 30, 2015	Jan. 03, 2017	Dec. 30, 2014
Successor [Member]
Revenue:
Company restaurant sales	$ 206,939		$ 434,064
Franchise revenue	7,328		15,676
Franchise sublease income	1,183		2,343
Total revenue	215,450		452,083
Restaurant operating expenses:
Food and paper costs	59,263		120,116
Labor and related expenses	61,448		135,725
Occupancy and other operating expenses	43,191		88,908
General and administrative	17,501		37,220
Depreciation and amortization	11,276		23,129
Occupancy and other - franchise subleases	1,140		2,207
Pre-opening costs	366		731
Impairment of long-lived assets	0		0
Restaurant closure charges, net	2,015		435
Loss (gain) on disposal of assets	3		312
Total operating expenses	196,203		408,783
Income from operations	19,247		43,300
Other expense, net:
Interest expense	3,652		6,327
Other income	(220)		0
Transaction-related costs	12,972		731
Debt modification costs	78		0
Change in fair value of warrant liability	0		0
Total other expense, net	16,482		7,058
Income (loss) from operations before provision for income taxes	2,765		36,242
Provision for income taxes	112		15,329
Net income (loss)	2,653		20,913
Other comprehensive income (loss):
Change in fair value of interest rate cap, net of tax	0		172
Reclassification of interest rate cap amortization included in net income (loss)	0		0
Total other comprehensive income (loss), net	0		172
Comprehensive income (loss)	$ 2,653		$ 21,085
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.07		$ 0.54
Diluted (in dollars per share)	$ 0.07		$ 0.53
Weighted-average shares outstanding:
Basic (in shares)	38,802,425		38,725,541
Diluted (in shares)	40,249,993		39,274,649
Predecessor [Member]
Revenue:
Company restaurant sales		$ 200,676		$ 380,800
Franchise revenue		6,693		12,973
Franchise sublease income		1,183		2,251
Total revenue		208,552		396,024
Restaurant operating expenses:
Food and paper costs		57,447		110,708
Labor and related expenses		61,120		116,920
Occupancy and other operating expenses		43,611		82,021
General and administrative		14,850		28,136
Depreciation and amortization		8,252		18,752
Occupancy and other - franchise subleases		1,109		2,145
Pre-opening costs		276		462
Impairment of long-lived assets		0		9,617
Restaurant closure charges, net		94		82
Loss (gain) on disposal of assets		99		(151)
Total operating expenses		186,858		368,692
Income from operations		21,694		27,332
Other expense, net:
Interest expense		11,491		30,895
Other income		0		0
Transaction-related costs		7,255		1,936
Debt modification costs		139		1,241
Change in fair value of warrant liability		(35)		1,417
Total other expense, net		18,850		35,489
Income (loss) from operations before provision for income taxes		2,844		(8,157)
Provision for income taxes		740		1,098
Net income (loss)		2,104		(9,255)
Other comprehensive income (loss):
Change in fair value of interest rate cap, net of tax		(24)		(125)
Reclassification of interest rate cap amortization included in net income (loss)		58		19
Total other comprehensive income (loss), net		34		(106)
Comprehensive income (loss)		$ 2,138		$ (9,361)
Earnings (loss) per share:
Basic (in dollars per share)		$ 0.38		$ (2.37)
Diluted (in dollars per share)		$ 0.37		$ (2.37)
Weighted-average shares outstanding:
Basic (in shares)		5,492,417		3,907,835
Diluted (in shares)		5,610,859		3,907,835