Common Shares and Net (Loss) Income per Common Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 29, 2016	Mar. 09, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net proceeds from offering of common stock			$ 3.5	$ 366.8	$ 143.1
June 2016 Offering [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares issued in offering	15,088,000
Public offering price per share	$ 15.25
Net proceeds from offering of common stock	$ 230.1
Underwriter commissions	9.2
Professional fees	$ 1.1
March 2016 Offering [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of shares issued in offering		12,765,000
Public offering price per share		$ 11.80
Net proceeds from offering of common stock		$ 150.6
Underwriter commissions		6.0
Professional fees		$ 0.8