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Long-Term Debt - Additional Information (Detail) - USD ($) | Jun. 05, 2015 | Jul. 31, 2015 | Apr. 30, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt |  | $ 0 | $ 0
Amendment of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Value of common shares repurchases permitted, dividends paid and permitted acquisitions for any fiscal year | $ 125,000,000 |  |
Value of common shares repurchases permitted and dividends paid for any fiscal year | 75,000,000 |  |
Amendment of Credit Facility | Cash, Cash Equivalents and Marketable Securities |  |  |
Debt Instrument [Line Items] |  |  |
Financial covenants amount | $ 50,000,000 |  |
Amendment of Credit Facility | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Quarterly Commitment Fees on the Facility's unused commitments | 0.25% |  |
Amendment of Credit Facility | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Quarterly Commitment Fees on the Facility's unused commitments | 0.40% |  |
Amendment of Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin on variable interest rate | 0.875% |  |
Amendment of Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin on variable interest rate | 1.75% |  |
Amendment of Credit Facility | Base Rate Loans | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin on variable interest rate | 0.00% |  |
Amendment of Credit Facility | Base Rate Loans | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Applicable margin on variable interest rate | 0.75% |  |
Standby Letters of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt arrangement |  | 2,800,000 | 2,800,000
Other Financial Institutions | Standby Letters of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt arrangement |  | $ 1,400,000 | $ 1,600,000
Revolving Credit Facility | Amendment of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, maximum borrowing capacity | $ 150,000,000 |  |
Revolving credit facility, additional optional increase to maximum borrowing capacity | $ 50,000,000 |  |
Revolving credit facility, extended maturity date | Jun. 03, 2020 |  |
Revolving Credit Facility | Letter of Credit | Amendment of Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility, maximum borrowing capacity | $ 15,000,000 |  |

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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 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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