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Pension plan (Tables)
 6 Months Ended
Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic pension costs
Components of net periodic pension costs during the quarters and six months ended December 31, 2011 and January 1, 2011 were as follows:

 
Second Quarters Ended
 
Six Months Ended
 
December 31,
2011
 
January 1,
2011
 
December 31,
2011
 
January 1,
2011
 
(Thousands)
Service cost
$
7,095

 
$
7,275

 
$
14,190

 
$
14,550

Interest cost
3,731

 
3,600

 
7,462

 
7,200

Expected return on plan assets
(6,734
)
 
(6,975
)
 
(13,468
)
 
(13,950
)
Recognized net actuarial loss
2,420

 
2,325

 
4,840

 
4,650

Amortization of prior service credit
(469
)
 
(475
)
 
(938
)
 
(950
)
Net periodic pension cost
$
6,043

 
$
5,750

 
$
12,086

 
$
11,500