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Long-Term Debt - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jun. 15, 2016 USD ($) | Jul. 31, 2018 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Principal payment on term loan facility |  | $ 5,156,000 | $ 5,156,000 |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility borrowings |  | 0 |  | $ 0
Line of credit facility, remaining borrowing capacity |  | 122,100,000 |  |
Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 2,900,000 |  | 2,900,000
Standby Letters of Credit | Other Financial Institutions |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 7,900,000 |  | 7,400,000
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 |  | $ 2,400,000 |  | 2,700,000
Credit Agreement | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Pro forma leverage ratio | 2.50 |  |  |
Credit Agreement | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 2.00% |  |
Credit Agreement | Maximum | Base Rate Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.00% |  |
Credit Agreement | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Pro forma domestic liquidity | $ 50,000,000 |  |  |
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 1.25% |  |
Credit Agreement | Minimum | Base Rate Loans |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  | 0.25% |  |
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 |  | 3.24% | 2.34% |
Line of credit facility, maturity date |  | Jun. 15, 2021 |  |
Long-term debt |  | $ 233,700,000 |  | $ 238,900,000
Credit Agreement | Term Facility | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  | 0.35% |  |
Credit Agreement | Term Facility | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  | 0.20% |  |
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 Debt Instrument Amortization Of Principal Percentage Year One + References No definition available. + Details
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- Definition Debt Instrument Amortization Of Principal Percentage Year Three + References No definition available. + Details
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- Definition Debt Instrument Amortization Of Principal Percentage Year Two + References No definition available. + Details
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- Definition The minimum amount of Domestic Liquidity must maintain in order to be in compliance with the debt covenant. + References No definition available. + Details
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- Definition Pro forma leverage ratio. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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