Net Fair Value of Commodity Price Risk (Detail) $ in Thousands	Jul. 18, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Assets	$ 76
Liabilities	(8,988)
Net Fair Value	(8,912)
Level 1
Derivatives, Fair Value [Line Items]
Assets	76
Liabilities	(5,678)
Net Fair Value	(5,602)
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(3,310)
Net Fair Value	(3,310)
Other LongTerm Assets
Derivatives, Fair Value [Line Items]
Assets	76
Other LongTerm Assets | Level 1
Derivatives, Fair Value [Line Items]
Assets	76
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(7,823)
Other Current Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(5,260)
Other Current Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(2,563)
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(1,165)
Other LongTerm Liabilities | Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(418)
Other LongTerm Liabilities | Level 2
Derivatives, Fair Value [Line Items]
Liabilities	$ (747)