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Restructuring (narrative) (detail) (USD $)	3 Months Ended			9 Months Ended
Restructuring (narrative) (detail) (USD $)	Dec. 27, 2014	Sep. 28, 2013	Jun. 29, 2013	Dec. 27, 2014	Dec. 28, 2013
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	$ 889,000us-gaap_RestructuringCharges	$ 347,000us-gaap_RestructuringCharges	$ 154,000us-gaap_RestructuringCharges	$ 889,000us-gaap_RestructuringCharges	$ 501,000us-gaap_RestructuringCharges
Midwest Plant [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	889,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	533,000
Employee Severance [Member] \| Midwest Plant [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	533,000
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	40,000	6,000	154,000
Other Restructuring [Member] \| Midwest Plant [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	40,000
Long Lived Asset Charges [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	316,000	341,000
Long Lived Asset Charges [Member] \| Midwest Plant [Member]
Restructuring Cost and Reserve [Line Items]
Plant Restructuring	$ 316,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details