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Reconciliation of Enterprise Value to Estimated Fair Value of Successor's Common Stock (Detail) - USD ($) $ in Thousands	Aug. 01, 2017	Jul. 31, 2017
Reorganizations [Abstract]
Enterprise Value		$ 1,050,000
Add: Cash and cash equivalents	$ 560,866	560,866
Less: Amounts due to General Unsecured Creditors	(39,757)	(102,193)
Less: Fair value of debt	(446,383)	(451,589)
Less: Fair value of New Creditor, Series A and B warrants		(299,045)
Less: Fair value of noncontrolling interests		(1,675)
Fair Value of Successor common stock	$ 18	$ 756,364

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