Share-Based Compensation - Additional Information (Detail) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended								1 Months Ended		3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended					1 Months Ended				12 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2011	Dec. 29, 2012 USD ($) Y	Dec. 31, 2011 USD ($)	Jan. 01, 2011 USD ($)	Jan. 02, 2010 USD ($)	Dec. 29, 2007 USD ($)	Dec. 29, 2012 CAD	Dec. 31, 2011 CAD	Jan. 01, 2011 CAD	Aug. 10, 2010 Share Appreciation Rights Plan [Member]	Jan. 01, 2011 Share Appreciation Rights Plan [Member]	Oct. 01, 2011 Performance-Based RSUs [Member] USD ($)	Dec. 29, 2012 Performance-Based RSUs [Member] USD ($)	Dec. 31, 2011 Performance-Based RSUs [Member] USD ($)	Jan. 01, 2011 Performance-Based RSUs [Member] USD ($)	Dec. 29, 2012 Time-Based RSUs [Member] USD ($)	Dec. 29, 2012 Time-Based RSUs [Member] USD ($)	Dec. 31, 2011 Time-Based RSUs [Member] USD ($)	Jan. 01, 2011 Time-Based RSUs [Member] USD ($)	Dec. 29, 2012 Stock Options [Member] USD ($)	Jan. 01, 2011 Stock Options [Member] USD ($)	May 03, 2012 2010 Equity Incentive Plan [Member] USD ($)	May 06, 2011 2010 Equity Incentive Plan [Member] USD ($)	May 04, 2010 2010 Equity Incentive Plan [Member] USD ($)	Dec. 31, 2012 2010 Equity Incentive Plan [Member]	Dec. 27, 2008 PSU Plan [Member]	Jan. 01, 2011 PSU Plan [Member]	Aug. 09, 2010 Stock Option Plan [Member] Chief Executive Officer [Member]	Apr. 03, 2010 Stock Option Plan [Member] Chief Executive Officer [Member] CAD	Dec. 29, 2012 Stock Option Plan [Member] Certain Employees [Member] USD ($)	Dec. 29, 2012 Stock Option Plan [Member] Certain Employees [Member] CAD	Dec. 31, 2011 Stock Option Plan [Member] Certain Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		$ 4.9	$ 2.9	$ 4.7								$ 3.3	$ 0.7	$ (1.2)	$ 1.4		$ 3.1	$ 3.4	$ 1.3	$ 0.4	$ 1.0	$ 0.7	$ 0.7	$ 0.7
Stock options granted, shares		385,000		250,000																385,000									250,000	385,000	385,000	0
Options granted, exercise price per share		$ 6.47		$ 8.01																									8.01	$ 6.58	6.47
Options granted, estimated fair value																													5.16	$ 4.04
Effective date of option award agreement cancellation																												Sep. 22, 2010
Closing price of common stock							7.90	6.40	8.95
Stock options exercised total intrinsic value			0.4
Options exercised, Shares		0	275,000	0
Compensation cost related to unvested awards		5.0											1.7			2.3	2.3			1.0
Fair value of shares vested
Shares reserved for future issuance																								4,000,000
Awarded													331,000	592,163	1,726,807		442,000	151,545	1,396,807			96,010	76,110	78,790
Time-based RSUs became vested and issued																7.1
Time-based RSUs, Performance-based RSUs, and stock options outstanding																									3,254,567
Shares available for future issuance																									745,433
Vesting period of awards		3 years																								3 years
Trustee held treasury shares		0																									600,000
Options vested		125,000									154,000
Options cancelled										100,000
Performance bonus amortized service period (years)						4 years
Employees deferral amount						1.1
Compensation expense of performance bonus					$ 0.1
Anticipated EBIT growth rate	10.00%
Term for company performance evaluation (years)		3