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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust	$ 8,846
Unrealized gain (losses) in fair value of trust assets	82
Obligations under the supplemental plan	$ 30,631
Predecessor
Defined Benefit Plan Disclosure [Line Items]
Investments held in Rabbi Trust		$ 8,759
Unrealized gain (losses) in fair value of trust assets		(95)
Unrealized losses in fair value of trust assets are net of income tax expense of		(223)
Obligations under the supplemental plan		$ 29,108