Post-Retirement Plans - Additional Information (Detail)	1 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2014 USD ($)	Sep. 30, 2014 Employee	Jan. 03, 2015 USD ($)	Jul. 18, 2015 USD ($)	Jul. 12, 2014 USD ($)	Jan. 03, 2015 USD ($)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of former employees covered | Employee		2,500
Percentage reduced in plan obligations		10.00%
Pension contributions				$ 7,500,000	$ 5,029,000
Expected pension income for fiscal 2015				2,500,000
Total cost and employer contributions				$ 14,500,000	$ 14,400,000
Plan No. 1
Pension and Other Postretirement Benefits Disclosure [Line Items]
Distributions from existing plan assets	$ 48,400,000
Settlement loss			$ 15,400,000
Plan No. 2
Pension and Other Postretirement Benefits Disclosure [Line Items]
Distributions from existing plan assets	$ 2,000,000
Settlement loss						$ 0