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Stockholders' Equity and Stock-Based Compensation - Textual (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 2 Months Ended |  |
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Feb. 22, 2010 | Nov. 30, 2008 | Dec. 27, 2008 | Nov. 30, 2008 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | Nov. 21, 2011 | Jun. 30, 2012 | Dec. 31, 2011 | Jan. 01, 2011 | May 24, 2013 | Feb. 24, 2015 | Nov. 29, 2010 | May 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock |  |  |  |  | 47,000,000 us-gaap_CommonStockSharesAuthorized | 47,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |  |  |  |  |
Common stock, par value per share (in dollars per share) |  |  |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |
Shares of preferred stock |  |  |  |  | 3,000,000 us-gaap_PreferredStockSharesAuthorized | 3,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) |  |  |  |  | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  |  |  |  |  |
Total cost of repurchase |  |  |  |  | $ 5,344,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 5,000,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue | $ 8,504,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |  |  |  |  |  |
Common stock repurchased and retired, shares |  |  |  |  | 362,633 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 332,771 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 587,766 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |  |  |  |  |  |  |  |
Weighted average price (in dollars per share) |  |  |  |  | $ 14.74 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 15.03 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 14.47 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |  |  |  |
Shares purchased under the ESPP |  |  |  |  | 122,112 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 126,068 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 113,512 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |  |  |  |  |  |  |
Estimated forfeiture rate |  |  |  |  | 10.70%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRate | 11.90%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRate | 7.60%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardForfeitureRate |  |  |  |  |  |  |  |
Excess tax benefit |  |  |  |  | 0 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | (53,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 910,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |  |  |  |  |  |
Initial vesting percentage | 25.00%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialVestingPercentage | 33.33%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialVestingPercentage |  |  |  |  |  |  |  |  |  |  |  |  |
Option term |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rate, percentage |  |  | 33.33%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage | 2.78%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage |  |  |  |  |  |  |  |  |  |  |
Period of vesting | 4 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value per share of stock options (in dollars per share) |  |  |  |  | $ 8.13 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 8.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 10.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |  |  |  |  |  |  |
Closing stock price (in dollars per share) |  |  |  |  | $ 16.59 nano_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsShareClosingPrice |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised |  |  |  |  | 3,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 2,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | 4,900,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |  |  |  |
Fair value of options vested |  |  |  |  | 3,200,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | 3,700,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | 3,600,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |  |  |  |  |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of salary withholdings |  |  |  |  | 10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |  |  |
Purchase price of common stock, percent |  |  |  |  | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |  |  |
Shares remaining for issuance under the ESPP |  |  |  |  | 400,000 nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardRemainingNumberOfAuthorizedShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |  |  |
Weighted average price of shares issued (in dollars per share) |  |  |  |  | $ 13.76 nano_StockIssuedDuringPeriodWeightedAveragePriceEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | $ 12.36 nano_StockIssuedDuringPeriodWeightedAveragePriceEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember | $ 14.16 nano_StockIssuedDuringPeriodWeightedAveragePriceEmployeeStockPurchasePlans / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting rate, percentage |  |  |  |  |  |  |  | 33.33%nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardVestingPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |
RSUs granted (in shares) |  |  |  |  | 473,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 348,328 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |
RSUs cancelled (in shares) |  |  |  |  | 98,473 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  |  | 5,700,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |  |
Weighted average remaining amortization period for unrecognized compensation costs |  |  |  |  | 1 year 10 months 16 days |  |  |  |  |  |  |  |  |  |
Shares per unit granted |  |  |  |  | 1.7 nano_ShareBasedCompensationArrangementByShareBasedPaymentAwardShareConversionRatio / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of vesting |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of vesting |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  |  | 2,500,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  |
Weighted average remaining amortization period for unrecognized compensation costs |  |  |  |  | 2 years 2 months 15 days |  |  |  |  |  |  |  |  |  |
November 29, 2010 Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of common stock approved to repurchase, Value |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember |
Total cost of repurchase |  |  |  |  |  |  | 4,900,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember |  |  | 4,300,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember | 800,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember |  |  |  |
Common stock repurchased and retired, shares |  |  |  |  |  |  |  |  | 667,406 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember |  |  |  |  |  |
Weighted average repurchase price of common stock (in dollars per share) |  |  |  |  |  |  |  |  | $ 14.97 nano_WeightedAverageRepurchasePriceOfCommonStock / us-gaap_PlanNameAxis = nano_NovemberTwentyNineTwoThousandTenProgramMember |  |  |  |  |  |
May 29, 2012 Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of common stock approved to repurchase, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_PlanNameAxis = nano_MayTwentyNineTwoThousandTwelveProgramMember
Common stock repurchased and retired, shares |  |  |  |  |  |  | 250,400 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_PlanNameAxis = nano_MayTwentyNineTwoThousandTwelveProgramMember |  |  |  |  |  |  |  |
Weighted average repurchase price of common stock (in dollars per share) |  |  |  |  |  |  | $ 14.15 nano_WeightedAverageRepurchasePriceOfCommonStock / us-gaap_PlanNameAxis = nano_MayTwentyNineTwoThousandTwelveProgramMember |  |  |  |  |  |  |  |
2005 Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of restricted stock units against available for grant pool | 2 nano_RatioofRestrictedStockUnitsAgainstAvailableforGrantPool / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |  |  |  |  |  |  |  |  | 1.7 nano_RatioofRestrictedStockUnitsAgainstAvailableforGrantPool / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |
Number of shares of common stock authorized |  |  |  |  | 7,292,594 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |  |  |  |  | 2,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |
RSUs granted (in shares) |  |  |  |  | 805,120 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |  |  |  |  |  |  |  |
RSUs cancelled (in shares) |  |  |  |  | 167,404 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_PlanNameAxis = nano_TwoThousandFiveEquityIncentivePlanMember |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total cost of repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,700,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Common stock repurchased and retired, shares |  |  |  |  |  |  |  |  |  |  |  |  | 111,050 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.49 us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Remaining shares available for future repurchase (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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