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Condensed Consolidated Statements of Operations and Comperhensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenues	$ 147,456us-gaap_SalesRevenueNet	$ 148,331us-gaap_SalesRevenueNet	$ 450,680us-gaap_SalesRevenueNet	$ 416,457us-gaap_SalesRevenueNet
Cost of revenues	81,479us-gaap_CostOfRevenue	82,719us-gaap_CostOfRevenue	254,631us-gaap_CostOfRevenue	231,851us-gaap_CostOfRevenue
Gross profit	65,977us-gaap_GrossProfit	65,612us-gaap_GrossProfit	196,049us-gaap_GrossProfit	184,606us-gaap_GrossProfit
Operating expenses:
Research and development	15,236us-gaap_ResearchAndDevelopmentExpense	9,413us-gaap_ResearchAndDevelopmentExpense	39,893us-gaap_ResearchAndDevelopmentExpense	23,807us-gaap_ResearchAndDevelopmentExpense
Sales, general and administrative	5,510us-gaap_SellingGeneralAndAdministrativeExpense	6,064us-gaap_SellingGeneralAndAdministrativeExpense	16,568us-gaap_SellingGeneralAndAdministrativeExpense	17,648us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses	20,746us-gaap_OperatingExpenses	15,477us-gaap_OperatingExpenses	56,461us-gaap_OperatingExpenses	41,455us-gaap_OperatingExpenses
Income from operations	45,231us-gaap_OperatingIncomeLoss	50,135us-gaap_OperatingIncomeLoss	139,588us-gaap_OperatingIncomeLoss	143,151us-gaap_OperatingIncomeLoss
Interest expense and other, net	(763)us-gaap_OtherNonoperatingIncomeExpense	(283)us-gaap_OtherNonoperatingIncomeExpense	(804)us-gaap_OtherNonoperatingIncomeExpense	(778)us-gaap_OtherNonoperatingIncomeExpense
Income before provision for income taxes	44,468us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	49,852us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	138,784us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	142,373us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	3,331us-gaap_IncomeTaxExpenseBenefit	4,653us-gaap_IncomeTaxExpenseBenefit	13,639us-gaap_IncomeTaxExpenseBenefit	14,854us-gaap_IncomeTaxExpenseBenefit
Net income and comprehensive income	$ 41,137us-gaap_NetIncomeLoss	$ 45,199us-gaap_NetIncomeLoss	$ 125,145us-gaap_NetIncomeLoss	$ 127,519us-gaap_NetIncomeLoss
Net income per share of common stock:
Basic (in usd per share)	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic	$ 1.42us-gaap_EarningsPerShareBasic	$ 1.45us-gaap_EarningsPerShareBasic
Diluted (in usd per share)	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ 1.40us-gaap_EarningsPerShareDiluted	$ 1.42us-gaap_EarningsPerShareDiluted
Weighted average shares used in computing net income per share of common stock:
Basic (in shares)	87,904us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	87,901us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	88,115us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	87,656us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	89,400us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	89,775us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	89,707us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	89,667us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash dividends declared per common share	$ 0us-gaap_CommonStockDividendsPerShareDeclared	$ 0us-gaap_CommonStockDividendsPerShareDeclared	$ 0.17us-gaap_CommonStockDividendsPerShareDeclared	$ 0us-gaap_CommonStockDividendsPerShareDeclared

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