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Pension plan (Tables)
 6 Months Ended
Dec. 29, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic pension costs
Components of net periodic pension costs during the quarters ended December 29, 2012 and December 31, 2011 were as follows:
 
Second Quarters Ended
 
Six Months Ended
 
December 29,
2012
 
December 31,
2011
 
December 29,
2012
 
December 31,
2011
 
(Thousands)
Service cost
$
9,230

 
$
7,095

 
$
18,460

 
$
14,190

Interest cost
3,663

 
3,731

 
7,326

 
7,462

Expected return on plan assets
(6,976
)
 
(6,734
)
 
(13,952
)
 
(13,468
)
Recognized net actuarial loss
3,724

 
2,420

 
7,448

 
4,840

Amortization of prior service credit
(393
)
 
(469
)
 
(786
)
 
(938
)
Net periodic pension cost
$
9,248

 
$
6,043

 
$
18,496

 
$
12,086