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Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014 Y Store	Jan. 31, 2013	Jan. 31, 2012	Nov. 27, 2012 Nonqualified Deferred Compensation Plan	Jan. 31, 2014 Minimum	Jan. 31, 2014 Maximum
Commitments and Contingencies Disclosure [Line Items]
Number of lease commitment not opened	27
Commitments for un-fulfilled purchase orders	$ 367,003,000
Commitments with construction contractors	29,350,000
U.S. based employees age limit to participate in 401(k) Saving Plan	18
Percentage of compensation deferred by employees under Saving Plan					1.00%	25.00%
Employer matching contribution per employee	0.25			0.25
Percentage of employee contribution for first threshold limit of employer contribution	6.00%			6.00%
Employees contribution percentage vested	100.00%			100.00%
Percentage of employers contribution per year vested	20.00%			100.00%
Company's contribution to Savings Plan	1,770,000	1,483,000	1,365,000	1,666,000
Aggregate market value of investments				$ 1,666,000

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The amount of the cost recognized during the period for defined contribution plans.

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Nominal or face amount on the investment owned.

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