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Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Apr. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 2,883	$ 4,115
Financial Liabilities		4,467
Interest rate swap derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities		5
Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	3,256	4,462
Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,818	4,050
Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	65	65
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,818	4,050
Financial Liabilities		0
Level 1 | Interest rate swap derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities		0
Level 1 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	0	0
Level 1 | Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	2,818	4,050
Level 1 | Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	65	65
Financial Liabilities		4,467
Level 2 | Interest rate swap derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities		5
Level 2 | Non Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	3,256	4,462
Level 2 | Trading Securities Held in Non-Qualified Compensation Plans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	0	0
Level 2 | Cash Surrender Value of Life Insurance Policies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 65	$ 65

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

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