XML 41 R52.htm IDEA: XBRL DOCUMENT v2.4.1.9
Net Income (Loss) Per Share - Schedule of Antidilutive Securities Excluded from Computation of Net Income (Loss) Per Share (Details)
In Thousands, unless otherwise specified
 12 Months Ended
May 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive securities excluded from computation of earnings per share 880us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1,057us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 8,347us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
5.0% Convertible Senior Notes Due 2029        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Interest rate 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fnsr_ConvertibleSeniorNotesDue2029FiscalYear2030Member		 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fnsr_ConvertibleSeniorNotesDue2029FiscalYear2030Member		    
0.5% Convertible Senior Notes Due 2033        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Interest rate 0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fnsr_A0.5ConvertibleSeniorNotesDue2033Member		 0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fnsr_A0.5ConvertibleSeniorNotesDue2033Member		   0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fnsr_A0.5ConvertibleSeniorNotesDue2033Member
Stock Options and Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive securities excluded from computation of earnings per share 880us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= fnsr_StockOptionsandRestrictedStockUnitsMember		 1,057us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= fnsr_StockOptionsandRestrictedStockUnitsMember		 4,599us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= fnsr_StockOptionsandRestrictedStockUnitsMember		  
Convertible Debt | 5.0% Convertible Senior Notes Due 2029        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_DebtInstrumentAxis
= fnsr_ConvertibleSeniorNotesDue2029FiscalYear2030Member		 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_DebtInstrumentAxis
= fnsr_ConvertibleSeniorNotesDue2029FiscalYear2030Member		 3,748us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_DebtInstrumentAxis
= fnsr_ConvertibleSeniorNotesDue2029FiscalYear2030Member		  
Convertible Debt | 0.5% Convertible Senior Notes Due 2033        
Antidilutive Securities Excluded from Computation of Earnings Per Share        
Antidilutive securities excluded from computation of earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_DebtInstrumentAxis
= fnsr_A0.5ConvertibleSeniorNotesDue2033Member		 [1] 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_ConvertibleDebtMember
/ us-gaap_DebtInstrumentAxis
= fnsr_A0.5ConvertibleSeniorNotesDue2033Member		 [1]    
[1] 0.50% Convertible Senior Notes due 2033 were excluded from the calculation of diluted earnings per share under the treasury stock method since the conversion price exceeded the average market price for the Company's common stock.