Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Numerator:
Net income	$ 147,023	$ 141,034	$ 286,053	$ 279,208
Denominator:
Weighted average common shares for basic earnings per share	147,188,000	152,137,000	149,729,000	152,071,000
Net effect of dilutive stock options and performance share awards	2,478,000	2,122,000	2,357,000	1,881,000
Weighted average common shares for diluted earnings per share	149,666,000	154,259,000	152,086,000	153,952,000
Basic earnings per share	$ 1.00	$ 0.93	$ 1.91	$ 1.84
Diluted earnings per share	$ 0.98	$ 0.91	$ 1.88	$ 1.81
Earnings per share (Textuals) [Abstract]
Antidilutive shares	238,000	252,000	585,000	610,000