Credit facility additional borrowing capacity option to increase maximum borrowing capacity.

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Debt instrument call premium.

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Maximum consolidated coverage ratio.

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Minimum consolidated coverage ratio.

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Percentage of consolidated net income.

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Percentage of floating rate debt covered.

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Percentage of interest rate protection.

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- Definition

Redemption notice period.

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

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Amount of the total principal payments made during the annual reporting period.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Description of debt redemption features under terms of the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Fixed interest rate related to the interest rate derivative.

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No definition available.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

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No definition available.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

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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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No definition available.

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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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Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

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The effective interest rate during the reporting period.

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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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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of stock repurchase plan authorized.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Notes and Loans Payable and Financing Arrangements - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015	Mar. 27, 2017	Oct. 27, 2016	Jul. 31, 2015	Jul. 06, 2015	Jun. 18, 2015	Jun. 15, 2015
Debt Instrument [Line Items]
Interest description of revolving line of credit	The Revolving Line provides for availability for general corporate purposes with borrowings to bear interest at a variable rate equal to LIBOR or prime plus an applicable margin based on our consolidated leverage ratio, at our election.
Percentage of interest rate protection on term loan									75.00%
Fair value of the interest rate swap asset	$ 572,000
Fair value of the interest rate swap liability		$ 1,300,000
Maximum consolidated coverage ratio	300.00%
Minimum consolidated coverage ratio	100.00%
Amortization to interest expense for all debt issuance costs	$ 918,000	2,700,000	$ 1,500,000
Notes payable
Debt Instrument [Line Items]
Debt issuance cost	$ 525,000	1,000,000
Maximum
Debt Instrument [Line Items]
Senior notes indenture, number of shares allowed for repurchase		50,000,000		$ 50,000,000
Interest Rate Swap
Debt Instrument [Line Items]
Percentage of floating rate debt covered								100.00%
Derivative, notional amount								$ 105,000,000
Derivative, maturity date	Jun. 15, 2020
Derivative, fixed interest rate							1.56%
Derivative, variable interest rate of one-month LIBOR						0.188%
Term Loan
Debt Instrument [Line Items]
Outstanding debt	$ 94,000,000								$ 105,000,000
Principal payments per annum	$ 6,300,000
Debt instrument, interest rate, effective percentage	3.06%
5.875% Senior notes due 2017
Debt Instrument [Line Items]
Debt instrument, interest rate									5.875%
Debt instrument call premium value	$ 2,900,000
Debt issuance write-off costs		$ 1,700,000
5.875% Senior notes due 2017 \| LIBOR Rate
Debt Instrument [Line Items]
Outstanding debt	$ 100,000,000
5.000% Senior Notes due 2018
Debt Instrument [Line Items]
Debt issuance cost			$ 2,300,000
Debt instrument, interest rate	5.00%		5.00%
Notes issued			$ 75,000,000
Description of redemption for senior notes	upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 5.000% Senior Notes at a redemption price of (a) 102.500% of the principal amount of the 5.000% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on July 15, 2016; or (b) 100% of the principal amount of the 5.000% Senior Notes to be redeemed, if redeemed during the 12-month period beginning on July 15, 2017, plus, in either case, accrued and unpaid interest on the 5.000% Senior Notes as of the applicable redemption date.
Debt instrument maturity date	Jul. 15, 2018
Senior notes indenture, maximum number of shares allowed for repurchase as a percentage of consolidated net income for previous four consecutive published fiscal quarters	75.00%
5.000% Senior Notes due 2018 \| Minimum
Debt Instrument [Line Items]
Notice period of senior notes	30 days
Senior notes indenture, number of shares allowed for repurchase	$ 50,000,000
5.000% Senior Notes due 2018 \| Maximum
Debt Instrument [Line Items]
Notice period of senior notes	60 days
Senior notes indenture, number of shares allowed for repurchase	$ 75,000,000
5.000% Senior Notes due 2018 \| Debt Instrument Redemption Scenario One
Debt Instrument [Line Items]
Redemption price of senior notes	102.50%
5.000% Senior Notes due 2018 \| Debt Instrument Redemption Scenario Two
Debt Instrument [Line Items]
Redemption price of senior notes	100.00%
Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity									$ 175,000,000
Credit Facilities
Debt Instrument [Line Items]
Borrowings outstanding	$ 50,000,000
Outstanding letters of credit	$ 1,000,000
Credit Facilities \| LIBOR Rate
Debt Instrument [Line Items]
Interest rate on borrowings	2.49%
Second Amendment \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity					$ 350,000,000
Credit facility additional borrowing capacity option to increase maximum borrowing capacity					150,000,000
Credit facility, maturity	Oct. 27, 2021
Debt issuance cost					$ 525,000