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Stock-Based Compensation (Deferred Stock) - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Non Employee Directors | Annual Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares received	46,240
Issuance of deferred compensation (in shares)	66,270
Non Employee Directors | Annual Grants | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Deferred Stock Activity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP		$ 0.4
Expected weighted-average period to recognize compensation cost (years)	5 months 1 day
Total fair value of shares vested	$ 1.4
Retainer Conversion
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retainers conversion into deferred shares	100.00%
Vesting period	1 year
Previous Director Retainer Deferrals
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares vested	15,822
Common shares issued	15,822
Director Retainer Deferrals | Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares received	2,707

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