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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 15, 2016 | Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2017
Debt Instrument [Line Items] |  |  |  |
Principal payment on term loan facility |  | $ 5,156,000 | $ 140,000,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility borrowings |  | 0 |  | $ 0
Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 3,000,000 |  | 3,000,000
Other Financial Institutions | Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 8,800,000 |  | 8,100,000
Credit Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit agreement initiation date | Jun. 15, 2016 |  |  |
Line of credit facility, maximum borrowing capacity | $ 400,000,000 |  |  |
Line of credit facility borrowings | 275,000,000 |  |  |
Principal payment on term loan facility | 140,000,000 |  |  |
Unamortized debt issuance costs |  | $ 3,400,000 |  | 3,500,000
Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.25% |  |
Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 2.00% |  |
Credit Agreement | Base Rate Loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 0.25% |  |
Credit Agreement | Base Rate Loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.00% |  |
Credit Agreement | Term Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 275,000,000 |  |  |
Term loan amortization percentage year one | 7.50% |  |  |
Term loan amortization percentage year two | 7.50% |  |  |
Term loan amortization percentage year three | 10.00% |  |  |
Term loan amortization percentage year four | 10.00% |  |  |
Term loan amortization percentage year five | 10.00% |  |  |
Principal payment on term loan facility |  | $ 5,200,000 |  |
Average interest rate |  | 2.34% | 2.40% |
Long-term debt |  | $ 254,400,000 |  | $ 259,500,000
Line of credit facility, maturity date |  | Jun. 15, 2021 |  |
Credit Agreement | Term Facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  | 0.20% |  |
Credit Agreement | Term Facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  | 0.35% |  |
Credit Agreement | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 125,000,000 |  |  |
Line of credit facility, maturity date |  | Jun. 15, 2021 |  |

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- Definition Debt Instrument Amortization of Principal Percentage Year Four + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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