Fair Value of Financial Instruments - Schedule of Assets Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jan. 30, 2016	Jan. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	$ 46,796	$ 19,293
Total	199,651	99,799
Money market funds [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	70	44
Commercial paper [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	46,726	18,248
Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents		1,001
Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	70	44
Total	29,910	44
Level 1 [Member] \| Money market funds [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	70	44
Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	46,726	19,249
Total	169,741	99,755
Level 2 [Member] \| Commercial paper [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents	46,726	18,248
Level 2 [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total cash equivalents		1,001
Short-term investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	130,801	62,168
Short-term investments [Member] \| Commercial paper [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	15,488	13,996
Short-term investments [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	115,313	48,172
Short-term investments [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	22,011
Short-term investments [Member] \| Level 1 [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	22,011
Short-term investments [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	108,790	62,168
Short-term investments [Member] \| Level 2 [Member] \| Commercial paper [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	15,488	13,996
Short-term investments [Member] \| Level 2 [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	93,302	48,172
Long-term investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	22,054	18,338
Long-term investments [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	22,054	18,338
Long-term investments [Member] \| Level 1 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	7,829
Long-term investments [Member] \| Level 1 [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	7,829
Long-term investments [Member] \| Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	14,225	18,338
Long-term investments [Member] \| Level 2 [Member] \| Government agency obligations [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total investments	$ 14,225	$ 18,338

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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