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Notes and Loans Payable and Financing Arrangements - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |  |
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Mar. 08, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Feb. 28, 2018 | Oct. 27, 2016 | Jul. 31, 2015 | Jul. 06, 2015 | Jun. 30, 2015 | Jun. 18, 2015 | Jun. 15, 2015 | Apr. 30, 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 |  | $ 2,100,000 | $ 572,000 |  |  |  |  |  |  |  |  |
Senior notes indenture, number of shares allowed for repurchase |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Amortization to interest expense for all debt issuance costs |  | 1,100,000 | 918,000 | $ 2,700,000 |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  | $ 158,000 | 525,000 | 1,000,000 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes indenture, number of shares allowed for repurchase |  |  | $ 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 |  | $ 87,700,000 |  |  |  |  |  |  |  |  | $ 105,000,000 |
Principal payments per annum |  | $ 6,300,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, effective percentage |  | 4.14% |  |  |  |  |  |  |  |  |  |
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%
Debt issuance write-off costs |  | $ 226,000 |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000
Debt instrument, redemption date | Mar. 08, 2018 |  |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  | $ 158,000 |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 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 2020 Senior Notes at a redemption price of 102.500% of the principal amount of the 2020 Senior Notes to be redeemed plus accrued and unpaid interest as of the applicable redemption date. On or after February 28, 2019, we may, at our option, upon not less than 30 nor more than 60 days’ prior notice, redeem all or a portion of the 2020 Senior Notes at a redemption price of 100.000% of the principal amount of the 2020 Senior Notes to be redeemed plus accrued and unpaid interest as of the applicable redemption date. |  |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  | Aug. 28, 2020 |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |
Maximum consolidated coverage ratio |  | 300.00% |  |  |  |  |  |  |  |  |  |
Minimum consolidated coverage ratio |  | 100.00% |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes indenture, number of shares allowed for repurchase |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Senior notes indenture, number of shares allowed for repurchase |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario One |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of senior notes |  | 102.50% |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario One | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notice period of senior notes |  | 30 days |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario One | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notice period of senior notes |  | 60 days |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario Two |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price of senior notes |  | 100.00% |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario Two | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notice period of senior notes |  | 30 days |  |  |  |  |  |  |  |  |  |
5.000% Senior Notes due 2020 | Debt Instrument Redemption Scenario Two | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notice period of senior notes |  | 60 days |  |  |  |  |  |  |  |  |  |
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 |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Credit Facilities | LIBOR Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on borrowings |  | 4.15% |  |  |  |  |  |  |  |  |  |
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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