Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Net revenues	$ 140,203us-gaap_SalesRevenueNet	$ 119,449us-gaap_SalesRevenueNet	$ 387,155us-gaap_SalesRevenueNet	$ 345,187us-gaap_SalesRevenueNet
Cost of revenues	57,802us-gaap_CostOfRevenue	38,446us-gaap_CostOfRevenue	158,649us-gaap_CostOfRevenue	111,378us-gaap_CostOfRevenue
Gross profit	82,401us-gaap_GrossProfit	81,003us-gaap_GrossProfit	228,506us-gaap_GrossProfit	233,809us-gaap_GrossProfit
Operating expenses:
Engineering and development	34,802us-gaap_ResearchAndDevelopmentExpense	35,235us-gaap_ResearchAndDevelopmentExpense	108,103us-gaap_ResearchAndDevelopmentExpense	110,412us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	16,153us-gaap_SellingAndMarketingExpense	16,113us-gaap_SellingAndMarketingExpense	47,640us-gaap_SellingAndMarketingExpense	51,957us-gaap_SellingAndMarketingExpense
General and administrative	7,677us-gaap_GeneralAndAdministrativeExpense	7,406us-gaap_GeneralAndAdministrativeExpense	25,274us-gaap_GeneralAndAdministrativeExpense	22,698us-gaap_GeneralAndAdministrativeExpense
Special charges	69qlgc_SpecialCharges	1,947qlgc_SpecialCharges	4,872qlgc_SpecialCharges	18,329qlgc_SpecialCharges
Total operating expenses	58,701us-gaap_OperatingExpenses	60,701us-gaap_OperatingExpenses	185,889us-gaap_OperatingExpenses	203,396us-gaap_OperatingExpenses
Operating income	23,700us-gaap_OperatingIncomeLoss	20,302us-gaap_OperatingIncomeLoss	42,617us-gaap_OperatingIncomeLoss	30,413us-gaap_OperatingIncomeLoss
Interest and other income (expense), net	(269)us-gaap_OtherNonoperatingIncomeExpense	970us-gaap_OtherNonoperatingIncomeExpense	169us-gaap_OtherNonoperatingIncomeExpense	1,768us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	23,431	21,272	42,786	32,181
Income taxes	996us-gaap_IncomeTaxExpenseBenefit	686us-gaap_IncomeTaxExpenseBenefit	3,341us-gaap_IncomeTaxExpenseBenefit	3,668us-gaap_IncomeTaxExpenseBenefit
Net income	$ 22,435us-gaap_NetIncomeLoss	$ 20,586us-gaap_NetIncomeLoss	$ 39,445us-gaap_NetIncomeLoss	$ 28,513us-gaap_NetIncomeLoss
Net income per share:
Basic	$ 0.26us-gaap_EarningsPerShareBasic	$ 0.24us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.32us-gaap_EarningsPerShareBasic
Diluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.32us-gaap_EarningsPerShareDiluted
Number of shares used in per share calculations:
Basic	87,728	86,855	87,679	87,810
Diluted	88,527	87,186	88,294	88,209

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan, asset impairment charges and other charges. Costs of exit or disposal activities includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement.

No definition available.