Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) $ in Thousands |
Jan. 29, 2017 |
May 01, 2016 |
Jan. 31, 2016 |
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|---|---|---|---|---|---|---|
| Income Taxes [Line Items] | ||||||
| Non-current deferred tax asset | $ 422 | $ 2,319 | [1] | $ 4,312 | ||
| Non-current deferred tax liability | 2,924 | 1,483 | [1] | 1,209 | ||
| U.S. Tax Authorities [Member] | ||||||
| Income Taxes [Line Items] | ||||||
| Non-current deferred tax asset | 1,700 | 3,500 | ||||
| Non-current deferred tax liability | 1,200 | |||||
| China [Member] | ||||||
| Income Taxes [Line Items] | ||||||
| Non-current deferred tax asset | 422 | 572 | 773 | |||
| Canada [Member] | ||||||
| Income Taxes [Line Items] | ||||||
| Non-current deferred tax liability | $ 1,700 | $ 1,500 | $ 1,200 | |||
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