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Pension plan (Tables)
 9 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of net periodic pension costs
Components of net periodic pension costs during the quarters and nine months ended March 31, 2012 and April 2, 2011 were as follows:

 
Third Quarters Ended
 
Nine Months Ended
 
March 31,
2012
 
April 2,
2011
 
March 31,
2012
 
April 2,
2011
 
(Thousands)
Service cost
$
7,095

 
$
3,356

 
$
21,285

 
$
17,906

Interest cost
3,731

 
3,240

 
11,193

 
10,440

Expected return on plan assets
(6,734
)
 
(6,720
)
 
(20,202
)
 
(20,670
)
Recognized net actuarial loss
2,420

 
2,054

 
7,260

 
6,704

Amortization of prior service credit
(469
)
 
(457
)
 
(1,407
)
 
(1,407
)
Net periodic pension cost
$
6,043

 
$
1,473

 
$
18,129

 
$
12,973