Net Assets in Liquidation - Allowed and Disputed General Unsecured Claims and Potential Term Loan Avoidance Action Claims (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Loss Contingencies [Line Items]
Beginning balance	$ 33,400,418	$ 33,403,235
New Allowed General Unsecured Claims		1,401
Term Loan Avoidance Action Claims resolved or disallowed	(143)	(4,218)
Ending balance	33,400,275	33,400,418
Allowed General Unsecured Claims [Member]
Loss Contingencies [Line Items]
Beginning balance	31,855,432	31,854,031
New Allowed General Unsecured Claims		1,401
Ending balance	31,855,432	31,855,432
Disputed General Unsecured Claims [Member]
Loss Contingencies [Line Items]
Beginning balance	50,000	50,000
New Allowed General Unsecured Claims		0
Ending balance	50,000	50,000
Term Loan Avoidance Action Claims [Member]
Loss Contingencies [Line Items]
Beginning balance	1,494,986	1,499,204
New Allowed General Unsecured Claims		0
Term Loan Avoidance Action Claims resolved or disallowed	(143)	(4,218)
Ending balance	1,494,843	1,494,986
Maximum Amount of Unresolved Claims [Member]
Loss Contingencies [Line Items]
Beginning balance	1,544,986	1,549,204
New Allowed General Unsecured Claims		0
Term Loan Avoidance Action Claims resolved or disallowed	(143)	(4,218)
Ending balance	$ 1,544,843	$ 1,544,986