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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 |  |  |  |

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