Employee Benefit Plans - Amounts Recognized in Other Comprehensive (Gain) Loss (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 29, 2014 |
Dec. 27, 2014 |
Dec. 28, 2013 |
Dec. 29, 2012 |
|
| Amounts recognized in other comprehensive loss (income): | ||||
| Total amount recognized | $ (2,164) | $ 3,919 | $ (4,407) | $ 3,648 |
| Pension Benefits [Member] | ||||
| Amounts recognized in other comprehensive loss (income): | ||||
| Net actuarial gain (loss) | 4,650 | (2,838) | 2,444 | |
| Amortization of gain | (117) | (387) | (261) | |
| Total amount recognized | 4,533 | (3,225) | 2,183 | |
| Healthcare & Life Ins [Member] | ||||
| Amounts recognized in other comprehensive loss (income): | ||||
| Net actuarial gain (loss) | 1,992 | (1,048) | 1,597 | |
| Prior service cost | (2,553) | |||
| Amortization of prior year service cost | 174 | 180 | 180 | |
| Curtailment benefit | 1,346 | |||
| Amortization of gain | (227) | (314) | (312) | |
| Total amount recognized | $ 732 | $ (1,182) | $ 1,465 | |