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WEIGHTED AVERAGE COMMON SHARES (Details)
3 Months Ended
Apr. 04, 2015
Mar. 31, 2014
Stock options    
Weighted average common shares    
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares) 2,154,115us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sumr_EmployeeAndDirectorsStockOptionsMember
1,833,930us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= sumr_EmployeeAndDirectorsStockOptionsMember
Restricted shares    
Weighted average common shares    
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares) 311,124us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember
345,417us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockMember