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Major Customers - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Customer One
Revenue, Major Customer [Line Items]
Percentage of net sales from major customer	21.30%	18.70%	17.30%
Customer Two
Revenue, Major Customer [Line Items]
Percentage of net sales from major customer	9.50%	12.30%	12.40%

X

- Details

Name:	us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration