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Pension plan (Tables)
 3 Months Ended
Sep. 29, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic pension costs
Components of net periodic pension costs during the quarters ended September 29, 2012 and October 1, 2011 were as follows:
 
First Quarters Ended
 
September 29,
2012
 
October 1,
2011
 
(Thousands)
Service cost
$
9,230

 
$
7,095

Interest cost
3,663

 
3,731

Expected return on plan assets
(6,976
)
 
(6,734
)
Recognized net actuarial loss
3,724

 
2,420

Amortization of prior service credit
(393
)
 
(469
)
Net periodic pension cost
$
9,248

 
$
6,043