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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 22, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 27, 2014 | Dec. 28, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,844,824 us-gaap_CommonStockSharesOutstanding |  |
Beginning balance |  |  |  | $ 290,433,000 us-gaap_StockholdersEquity |  |
Stock option exercises, shares | 1,867,370 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |
Stock option exercises, amount |  |  |  | 4,099,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions |  |
Stock-based compensation |  |  |  | 1,408,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  |
Net income |  | 6,638,000 us-gaap_NetIncomeLoss | 5,892,000 us-gaap_NetIncomeLoss | 17,864,000 us-gaap_NetIncomeLoss |  | 12,028,000 us-gaap_NetIncomeLoss
Other comprehensive loss |  |  |  | (34,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | [1] |
Ending balance, common stock, shares |  | 8,857,449 us-gaap_CommonStockSharesOutstanding |  | 8,857,449 us-gaap_CommonStockSharesOutstanding |  |
Ending balance |  | 313,770,000 us-gaap_StockholdersEquity |  | 313,770,000 us-gaap_StockholdersEquity |  |
Pre-tax unrealized loss on available-for-sale investments |  |  |  | (53,000)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax |  |
Common Stock |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,844,824 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Beginning balance |  |  |  | 88,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock option exercises, shares |  |  |  | 12,625 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock option exercises, amount |  |  |  | 1,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Stock-based compensation |  |  |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Net income |  |  |  | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Other comprehensive loss |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Ending balance, common stock, shares |  | 8,857,449 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 8,857,449 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Ending balance |  | 89,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 89,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Additional paid-in capital |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 232,081,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock option exercises, amount |  |  |  | 4,098,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Stock-based compensation |  |  |  | 1,408,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Net income |  |  |  | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Other comprehensive loss |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Ending balance |  | 237,587,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 237,587,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Retained earnings |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 57,828,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Stock option exercises, amount |  |  |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Stock-based compensation |  |  |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Net income |  |  |  | 17,864,000 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Other comprehensive loss |  |  |  | 0 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Ending balance |  | 75,692,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 75,692,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Accumulated other comprehensive income |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 436,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Stock option exercises, amount |  |  |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Stock-based compensation |  |  |  | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Net income |  |  |  | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
Other comprehensive loss |  |  |  | (34,000)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | [1] |
Ending balance |  | $ 402,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 402,000 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |
[1] | Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized losses before tax on available-for-sale investments were $53,000 for the nine months ended December 27, 2014.

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