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Fair Value of Financial Instruments - Narrative (Detail) - USD ($)	12 Months Ended
	May. 03, 2015		Jan. 31, 2016	Feb. 01, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments	$ 10,004,000	[1]	$ 4,259,000	$ 8,384,000
Long-term investments	$ 2,415,000	[1]	3,590,000	2,063,000
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term investments, deposit account maturity period	3 months
Bank Deposit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deposit account	$ 1,600,000
Short-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term bond funds	8,400,000		4,300,000	8,400,000
Unrealized gain (loss) on investments	$ (95,000)		(181,000)	$ (66,000)
Long-term Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized gain (loss) on investments			$ (99,000)
[1] Derived from audited financial statements.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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