Goodwill and intangible assets (Details Textuals) (USD $)	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Goodwill and intangible assets (Textuals) [Abstract]
Customer relationship and trade name intangible assets acquired	$ 19,679,000		$ 19,679,000
Intangible assets carrying value	127,076,000		127,076,000
Intangible assets original cost value	189,197,000		189,197,000
Accumulated amortization and foreign currency translation	62,121,000		62,121,000
Weighted average life of intangible assets	8
Intangible asset amortization expense	6,127,000	4,761,000	12,290,000	9,770,000
Amortization expense year one	23,000,000
Amortization expense year two	23,000,000
Amortization expense year three	23,000,000
Amortization expense year four	16,000,000
Amortization expense year five	$ 14,000,000