Income Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Computation of basic and diluted income per share
Net income	$ 2,463us-gaap_NetIncomeLoss	$ 1,641us-gaap_NetIncomeLoss	$ 8,611us-gaap_NetIncomeLoss	$ 3,240us-gaap_NetIncomeLoss
Computation of common shares outstanding - basic income per share:
Weighted average shares of common stock	22,436	22,659	22,161	22,751
Basic income per share	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.07us-gaap_EarningsPerShareBasic	$ 0.39us-gaap_EarningsPerShareBasic	$ 0.14us-gaap_EarningsPerShareBasic
Computation of common shares outstanding - diluted income per share:
Weighted average shares of common stock	22,436psem_WeightedAverageSharesOfCommonStock	22,659psem_WeightedAverageSharesOfCommonStock	22,161psem_WeightedAverageSharesOfCommonStock	22,751psem_WeightedAverageSharesOfCommonStock
Dilutive shares using the treasury stock method	613	221	484	199
Shares used in computing diluted income per share	23,049	22,880	22,645	22,950
Diluted income per share	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.07us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.14us-gaap_EarningsPerShareDiluted

Weighted average shares of common stock.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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