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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

X

- Definition

Date the debt agreement requires to be made, in CCYY-MM-DD format.

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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.

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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.

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The maximum amount the Company can spend in a fiscal year in dividends to stockholder and repurchased shares.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Amount of the required periodic payments applied to principal.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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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.

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