Pensions and Other Postretirement Benefits (Details) (USD $)				3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 27, 2013	Apr. 28, 2013	Oct. 27, 2013 Maximum	Jul. 28, 2013 Successor	Oct. 27, 2013 Successor Pension Benefits	Oct. 27, 2013 Successor Pension Benefits	Oct. 27, 2013 Successor Other Retiree Benefits	Oct. 27, 2013 Successor Other Retiree Benefits	Jun. 07, 2013 Predecessor	Jul. 28, 2013 Predecessor	Jun. 07, 2013 Predecessor Pension Benefits	Oct. 28, 2012 Predecessor Pension Benefits	Oct. 28, 2012 Predecessor Pension Benefits	Jun. 07, 2013 Predecessor Other Retiree Benefits	Oct. 28, 2012 Predecessor Other Retiree Benefits	Oct. 28, 2012 Predecessor Other Retiree Benefits
Components of net periodic benefit cost
Service cost					$ 9,209,000	$ 14,283,000	$ 1,617,000	$ 2,525,000			$ 3,974,000	$ 7,968,000	$ 15,803,000	$ 740,000	$ 1,633,000	$ 3,247,000
Interest cost					31,593,000	49,016,000	2,240,000	3,497,000			13,576,000	33,371,000	66,253,000	937,000	2,492,000	4,965,000
Expected return on plan assets					(51,396,000)	(79,739,000)	0	0			(28,826,000)	(63,290,000)	(125,630,000)	0	0	0
Amortization of prior service cost/(credit)					0	0	0	0			245,000	641,000	1,273,000	(677,000)	(1,544,000)	(3,089,000)
Amortization of unrecognized loss					0	0	0	0			10,460,000	19,180,000	38,084,000	223,000	450,000	901,000
Defined Benefit Plan, Curtailments					14,854,000	14,854,000	(1,021,000)	(1,021,000)			0	0	0	0	0	0
Settlements					0	0	0	0			0	333,000	1,347,000	0	0	0
Special Termination Benefits					739,000	739,000	0	0			17,230,000	0	0	0	0	0
Net periodic benefit (income)/expense					4,999,000	(847,000)	2,836,000	5,001,000			16,659,000	(1,797,000)	(2,870,000)	1,223,000	3,031,000	6,024,000
Pensions and Other Post-Retirement Benefits (Textuals) [Abstract]
Accelerated compensation cost									17,200,000
Benefit obligation recognized for pension benefits as other non-current assets	428,900,000	399,900,000
Employer contribution				106,000,000						7,000,000
Expected full year combined cash contributions			$ 160,000,000