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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Nov. 23, 2015 | Jan. 31, 2016 | Jan. 31, 2016 | Apr. 30, 2015
Debt Instrument [Line Items] |  |  |  |
Value of common shares repurchases permitted, dividends paid and permitted acquisitions for any fiscal year |  | $ 135,000,000 | $ 135,000,000 |
Value of common shares repurchases permitted and dividends paid for any fiscal year |  | 85,000,000 | 85,000,000 |
Financial covenants amount |  | 50,000,000 | 50,000,000 |
Payment of principal |  |  | $ 2,500,000 |
Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  |  | 0.25% |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Quarterly fee on average daily unused amount of Credit Facilities |  |  | 0.40% |
London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  |  | 1.125% |
London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  |  | 1.875% |
Base Rate Loans | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  |  | 0.125% |
Base Rate Loans | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Applicable margin on variable interest rate |  |  | 0.875% |
Letter of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 25,000,000 | $ 25,000,000 |
Term Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 150,000,000 | $ 150,000,000 |
Line of credit facility, extended maturity date | Sep. 23, 2020 |  | Sep. 23, 2020 |
Senior unsecured loan, aggregate principal amount | $ 150,000,000 |  |  |
Payment of principal |  | 2,500,000 |  |
Quarterly installments |  | 7,800,000 |  |
Long-term debt |  | $ 147,500,000 | $ 147,500,000 |
Quarterly installments payment date |  | Apr. 01, 2016 |  |
Average interest rate |  | 1.56% |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 100,000,000 | $ 100,000,000 |
Line of credit facility, extended maturity date |  |  | Sep. 23, 2020 |
Line of credit facility borrowings |  | 0 | $ 0 | $ 0
Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | 2,900,000 | 2,900,000 | 2,800,000
Other Financial Institutions | Standby Letters of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt arrangement |  | $ 5,000,000 | $ 5,000,000 | $ 1,600,000

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- Definition The amount the Company must maintain of unrestricted cash and or marketable securities (excluding any marketable securities that are held in trust for the settlement of obligations under certain deferred compensation plans) as a condition of consummating permitted acquisitions, paying dividends to shareholders and repurchases of our common stock. + References No definition available. + Details
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- Definition The maximum amount the Company can spend in a fiscal year in dividends to stockholder, repurchased shares and permitted acquisitions according to the credit agreement. + References No definition available. + Details
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- Definition The maximum amount the Company can spend in a fiscal year in dividends to stockholder and repurchased shares. + References No definition available. + 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 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + 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 Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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