Goodwill and intangible assets (Details Textuals) (USD $)	3 Months Ended	9 Months Ended
Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Write-down due to exit of business			$ (5,408,000)
Weighted average life of intangible assets			8 years
Intangible asset amortization expense	$ 8,740,000	$ 6,853,000	$ 23,816,000	$ 19,143,000

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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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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