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Goodwill and intangible assets (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted average life of intangible assets			8 years
Intangible asset amortization expense	$ 8,022,000	$ 6,127,000	$ 15,076,000	$ 12,290,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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