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Information Regarding Operations in Reportable Segments (Detail) - USD ($) $ in Thousands |  | 4 Months Ended
--- | --- | ---
Jan. 14, 2017 | Apr. 21, 2018 | Apr. 22, 2017
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | $ 1,206,453 | $ 1,187,649
Gain on divestiture |  | $ (28,875) |  | (28,875)
Multi-employer pension plan withdrawal costs |  |  | 2,322 |
Restructuring charges |  |  | 1,259 |
Impairment of assets |  |  | 2,483 |
Depreciation and amortization |  |  | 44,189 | 47,188
Income from operations |  |  | 76,615 | 98,202
Interest expense |  |  | (10,996) | (11,625)
Interest income |  |  | 8,095 | 6,577
Pension plan settlement loss |  |  | (4,668) |
Other components of net periodic pension and postretirement benefits credit |  |  | 735 | 1,923
Income before income taxes |  |  | 69,781 | 95,077
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gain on divestiture |  |  |  | (28,875)
Unallocated Corporate Costs |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges |  |  | 28 |
Depreciation and amortization | [1] |  | 94 | (185)
Income from operations | [2] |  | (22,372) | (33,754)
DSD Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | 1,015,484 | 999,860
DSD Segment | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | 1,041,369 | 1,018,916
Multi-employer pension plan withdrawal costs |  |  | 2,322 |
Restructuring charges |  |  | 1,204 |
Impairment of assets |  |  | 2,483 |
Depreciation and amortization |  |  | 37,470 | 41,062
Income from operations |  |  | 84,425 | 87,261
DSD Segment | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | (25,885) | (19,056)
Warehouse Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | 190,969 | 187,789
Warehouse Segment | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | 245,814 | 237,676
Restructuring charges |  |  | 27 |
Depreciation and amortization |  |  | 6,625 | 6,311
Income from operations |  |  | 14,562 | 44,695
Warehouse Segment | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales |  |  | $ (54,845) | $ (49,887)
[1] | Represents costs allocated to the company’s corporate head office.
[2] | Represents costs allocated to the company’s corporate head office and pension plan settlement loss.

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