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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		$ 57,536
Total fair value of plan assets	[1]	8,908
Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			$ 57,146
Total fair value of plan assets			8,759
Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		56,928
Accrued income		608
Total fair value of plan assets		57,536
Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			56,465
Accrued income			681
Total fair value of plan assets			57,146
Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		8,909
Other pending transactions		(1)
Total fair value of plan assets		8,908
Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			8,760
Total fair value of plan assets			8,760
Measured At Net Asset Value | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,725
Total fair value of plan assets		1,725
Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,720
Total fair value of plan assets			1,720
US Government Agencies Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		4,238
US Government Agencies Debt Securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			3,770
US Government Agencies Debt Securities | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,692
US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,613
Collateralized mortgage securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,032
Collateralized mortgage securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			2,537
Corporate Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		49,420
Corporate Debt Securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			47,871
Cash and Cash Equivalents | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		834
Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			989
Cash and Cash Equivalents | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		246
Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			323
Cash and Cash Equivalents | Measured At Net Asset Value | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		49
Cash and Cash Equivalents | Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			72
Common stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		3,599
Common stock | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			3,561
Foreign Stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		183
Foreign Stock | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			132
American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,429
American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,387
Preferred American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		12
Preferred American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			20
Real Estate Investment Trusts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		72
Real Estate Investment Trusts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			76
Open Ended Mutual Funds | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,676
Open Ended Mutual Funds | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,648
Open Ended Mutual Funds | Measured At Net Asset Value | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,676
Open Ended Mutual Funds | Measured At Net Asset Value | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,648
Other | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,404
Other | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,298
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		4,629
Accrued income		608
Total fair value of plan assets		5,237
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			4,215
Accrued income			681
Total fair value of plan assets			4,896
Quoted Prices In Active Markets (Level 1) | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		6,173
Other pending transactions		(1)
Total fair value of plan assets		6,172
Quoted Prices In Active Markets (Level 1) | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			6,023
Total fair value of plan assets			6,023
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		4,238
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			3,770
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		851
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			832
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		219
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			345
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		27
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			15
Quoted Prices In Active Markets (Level 1) | Common stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		3,599
Quoted Prices In Active Markets (Level 1) | Common stock | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			3,561
Quoted Prices In Active Markets (Level 1) | Foreign Stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		183
Quoted Prices In Active Markets (Level 1) | Foreign Stock | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			132
Quoted Prices In Active Markets (Level 1) | American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,429
Quoted Prices In Active Markets (Level 1) | American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,387
Quoted Prices In Active Markets (Level 1) | Preferred American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		12
Quoted Prices In Active Markets (Level 1) | Preferred American Depository Receipts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			20
Quoted Prices In Active Markets (Level 1) | Real Estate Investment Trusts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		72
Quoted Prices In Active Markets (Level 1) | Real Estate Investment Trusts | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			76
Quoted Prices In Active Markets (Level 1) | Other | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		172
Quoted Prices In Active Markets (Level 1) | Other | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			100
Significant Observable Inputs (Level 2) | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		52,299
Total fair value of plan assets		52,299
Significant Observable Inputs (Level 2) | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			52,250
Total fair value of plan assets			52,250
Significant Observable Inputs (Level 2) | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,011
Total fair value of plan assets		1,011
Significant Observable Inputs (Level 2) | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			1,017
Total fair value of plan assets			1,017
Significant Observable Inputs (Level 2) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		841
Significant Observable Inputs (Level 2) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			781
Significant Observable Inputs (Level 2) | Collateralized mortgage securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		1,032
Significant Observable Inputs (Level 2) | Collateralized mortgage securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			2,537
Significant Observable Inputs (Level 2) | Corporate Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		49,420
Significant Observable Inputs (Level 2) | Corporate Debt Securities | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			47,871
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		615
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			644
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		170
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			236
Significant Observable Inputs (Level 2) | Other | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets		$ 1,232
Significant Observable Inputs (Level 2) | Other | Pension Plans, Defined Benefit | Predecessor
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets			$ 1,198
[1] The company plans to liquidate the rabbi trust (valued at $8.9 million as of December 31, 2017) in advance of paying a lump sum benefit to the former CEO in April 2018 of $9.6 million.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
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