Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands		Jun. 30, 2017	Mar. 31, 2017
Deferred Credits and Other Liabilities [Abstract]
Postretirement benefits liability		$ 3,310	$ 4,394
Pension liabilities		41,306	40,339
Deferred gain on vessel sales	[1]	3,315	88,923
Other		12,451	21,049
Other liabilities and deferred credits		$ 60,382	$ 154,705

[1] Deferred gains related to the company’s sale leaseback vessels were recognized as reorganization items in the first quarter of fiscal 2018 due to the company’s rejection of its lease contracts as part of the chapter 11 proceedings. Refer to Note (4) Reorganization Items. Amounts remaining at June 30, 2017 are related to the sale of a vessel to a joint venture.