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Income taxes (Details Textuals)	3 Months Ended		9 Months Ended
Income taxes (Details Textuals)	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate	40.30%	26.60%	23.20%	28.30%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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