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Summary of Significant Accounting Policies - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Apr. 30, 2016	Apr. 30, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	$ 3,929	$ 3,730
Financial Liabilities	4,381	4,322
Trading Securities Held in Non-Qualified Compensation Plans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	3,867	3,683
Cash Surrender Value of Life Insurance Policies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	62	47
Non Qualified Compensation Plans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	4,215	4,119
Interest Rate Swap Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	166	203
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	3,867	3,683
Level 1 [Member] | Trading Securities Held in Non-Qualified Compensation Plans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	3,867	3,683
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	62	47
Financial Liabilities	4,381	4,322
Level 2 [Member] | Cash Surrender Value of Life Insurance Policies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Assets	62	47
Level 2 [Member] | Non Qualified Compensation Plans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	4,215	4,119
Level 2 [Member] | Interest Rate Swap Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities	$ 166	$ 203

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 825
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-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

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-Name Accounting Standards Codification
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