Income taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Apr. 02, 2011	Mar. 31, 2012	Apr. 02, 2011
Income taxes (Textuals) [Abstract]
Effective tax rate	26.60%	29.10%	28.30%	30.70%
Income tax adjustment				$ 19,800,000
Income Tax Adjustment Related To Write-Off Of Deferred Tax Asset Acquisitions Per Diluted Share				$ 0.13
Reasonably possible range of tax benefit expected to favorably impact rate	$15,000,000 to $17,000,000