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Retirement Plan - Schedule of Net Benefit Costs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 27, 2012
Dec. 29, 2011
Dec. 27, 2012
Dec. 29, 2011
Retirement Plans [Line Items]        
Service cost $ 85 $ 60 $ 171 $ 121
Interest cost 143 150 285 300
Amortization of prior service cost 240 240 479 479
Amortization of gain   (47)   (93)
Net periodic benefit cost $ 468 $ 403 $ 935 $ 807