Stock Option With Tandem SAR Awards Granted To Officers (Detail) (Stock Options And Tandem Stock Appreciation Rights, CAD) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013		Dec. 30, 2012
Stock Options And Tandem Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options with SARs outstanding at beginning of year	1,172		1,182
Granted, Stock Options with SARs			254
Exercised, Stock Options with SARs	(77)	[1]	(218)
Forfeited, Stock Options with SARs			(46)
Stock options with SARs outstanding at end of year	1,095		1,172
Stock options with SARs outstanding at beginning of year, Weighted Average Exercise Price	40.73		36.05
Granted, Weighted Average Grant Price			54.86
Exercised, Weighted Average Grant Price	32.57	[1]	31.64
Forfeited, Weighted Average Grant Price			41.66
Stock options with SARs outstanding at end of year, Weighted Average Grant Price	41.30		40.73

[1] Total cash settlement of $1.4 million of SARs in the first quarter of fiscal 2013 (first quarter fiscal 2012: $0.6 million). The associated options were cancelled.