Schedule of Weighted Average Grant-Date Fair Value and Assumptions Used (Detail) (USD $)	8 Months Ended	12 Months Ended
	Sep. 27, 2013	Jan. 31, 2014	Jan. 31, 2013		Jan. 31, 2012
Stock-Based Compensation [Abstract]
Weighted average grant-date fair value	$ 9.480	$ 9.040	$ 6.760	[1]	$ 15.730	[1]
Expected term (in years)	5 years	4 years 9 months 18 days	5 years		4 years 10 months 24 days
Expected volatility	30.00%	29.50%	24.50%		23.40%
Risk-free interest rate	1.40%	1.40%	1.00%		2.20%
Dividend yield	2.80%	2.40%	3.70%		0.00%

[1] Adjusted for additional awards granted for the $4.00 Special Dividend