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Note 12 - Net Loss Per Share (Details) - Excluded Antidiluted and Excluded Potentially Dilutive Securities
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Excluded Because Exercise Price is in Excess of Average Stock Price [Member] | Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options and awards excluded 3,898us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseExercisePriceIsInExcessOfAverageStockPriceMember
4,326us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseExercisePriceIsInExcessOfAverageStockPriceMember
5,401us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseExercisePriceIsInExcessOfAverageStockPriceMember
Excluded Because the Effect of Including Would be Anti-Dilutive [Member] | Employee Stock Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options and awards excluded 10us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
19us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
137us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
Excluded Because the Effect of Including Would be Anti-Dilutive [Member] | Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options and awards excluded 45us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
69us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
89us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecauseTheEffectOfIncludingWouldBeAntiDilutiveMember
Excluded Because Potential Buyback Shares Exceed Weighted Average Restricted Stock Units and Awards Outstanding [Member] | Restricted Stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options and awards excluded 121us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecausePotentialBuybackSharesExceedWeightedAverageRestrictedStockUnitsAndAwardsOutstandingMember
180us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecausePotentialBuybackSharesExceedWeightedAverageRestrictedStockUnitsAndAwardsOutstandingMember
255us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ sigm_ReasonsForExcludingOptionsAndAwardsAxis
= sigm_ExcludedBecausePotentialBuybackSharesExceedWeightedAverageRestrictedStockUnitsAndAwardsOutstandingMember