CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (LOSS) (USD $) In Thousands, unless otherwise specified	4 Months Ended	5 Months Ended	12 Months Ended
	Dec. 31, 2012	Aug. 30, 2012 Predecessor	Mar. 29, 2012 Predecessor	Mar. 31, 2011 Predecessor
Net earnings (loss)	$ (42,670)	$ 94,400	$ (81,988)	$ (122,853)
Foreign currency translation adjustment, net of tax	(530)	11,935	2,465	(5,678)
Pension and other benefit adjustments:
Net gain (loss) arising during the period, net of tax	7,279		(18,939)	(664)
Prior service credit arising during the period, net of tax		771	1,035	283
Amortization of net loss included in net periodic benefit costs, net of tax		987	5	137
Amortization of prior service credit included in net periodic benefit costs, net of tax		(448)	(984)	(865)
Settlement, net of tax	(15)
Unrealized gain (loss) on marketable securities:
Unrealized holding gain (loss) arising during the period, net of tax	1,915	(4,167)	(17,490)	5,972
Less: reclassification adjustment for gains (loss) included in investment expense ( income), net of tax	(2)	(44)	17,696
Unrealized gain from equity method investee's cash flow hedge, net of tax	797
Other comprehensive earnings (loss)	9,444	9,034	(16,212)	(815)
Total comprehensive earnings (loss)	$ (33,226)	$ 103,434	$ (98,200)	$ (123,668)