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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |
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May 06, 2013 | Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2014 Standby Letters of Credit [Member] | Aug. 10, 2014 Scenario, Forecast [Member] | Apr. 30, 2014 London Interbank Offered Rate (LIBOR) [Member] | Jun. 10, 2014 Subsequent Event [Member] | Jun. 10, 2014 Subsequent Event [Member] Maximum [Member] | Apr. 30, 2014 Unsecured Debt [Member] | Apr. 30, 2014 Unsecured Debt [Member] Minimum [Member] | Apr. 30, 2014 Unsecured Debt [Member] Maximum [Member] | May 06, 2013 Term Loan A [Member] | Apr. 30, 2014 Term Loan A [Member] | Apr. 30, 2014 Term Loan A [Member] August 1, 2017 [Member] | Apr. 30, 2014 Term Loan A [Member] September 1, 2017 [Member] | May 06, 2013 Term Loan B [Member] | Apr. 30, 2014 Term Loan B [Member] | Apr. 30, 2014 Term Loan B [Member] November 3, 2014 [Member] | Apr. 30, 2014 Line of Credit [Member] | Apr. 30, 2014 Secured Debt [Member] | Apr. 30, 2014 Revolving Credit Facilities [Member] | Apr. 30, 2014 Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan agreement | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding |  |  |  | 4,300,000 |  |  |  |  | 15,000,000 |  |  | 3,450,000 |  |  |  | 1,550,000 |  |  | 2,900,000 |  |  | 6,700,000
Letters of credit | 4,700,000 |  |  |  | 6,510,000 |  | 4,700,000 | 8,510,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility expiration date | May 01, 2016 |  |  |  |  |  |  |  | Jul. 31, 2014 |  |  | May 01, 2020 |  |  |  | May 01, 2020 |  |  |  |  |  |
Debt, variable interest rate |  |  |  |  |  | 1.575% |  |  | 1.575% | 1.575% | 2.175% |  |  |  |  |  | 1.575% |  | 1.50% |  |  |
Periodic payments |  | 17,000 |  |  |  |  |  |  |  |  |  |  |  | 17,000 | 79,000 |  | 18,000 |  |  |  |  |
Interest rate at period end |  |  |  |  |  |  |  |  | 1.773% |  |  |  |  |  |  |  |  |  | 1.75% |  |  |
Interest rate description |  | The Line of Credit, and the borrowing rate at that date was 1.75%. Monthly interest payments under the Line of Credit were payable at the Daily One Month LIBOR interest rate plus 1.5% per annum. |  |  |  |  |  |  | Monthly interest payments under the facility are payable calculated at the 30-day LIBOR Market Interest Rate plus a variable rate |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan, Payment terms |  | The term loan required monthly principal payments of $17,000, plus interest calculated at the 30-day LIBOR Market Index Rate plus 1.575%, with payment of the outstanding principal balance and any unpaid interest at the term loan maturity date. |  |  |  |  |  |  |  |  |  |  | Payments are due under Term Loan A in consecutive equal monthly principal payments in the amount of $17,000 until August 1, 2017, and then in consecutive equal monthly principal payments in the amount of $79,000 each, commencing on September 1, 2017 and continuing on the first business day of each month thereafter until May 1, 2020, and at that time, all principal, accrued unpaid interest and other charges outstanding under Term Loan A shall be due and payable in full. |  |  |  | Payments in the amount of $18,000 until May 1, 2020, and at that time, all principal |  |  |  |  |
Fixed rate percentage |  | 4.875% |  |  |  |  |  |  |  |  |  |  | 4.875% | 4.37% |  |  | 1.73% | 3.07% |  |  |  |
Principal payment for the year 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 421,000 |  |
Principal payment for the year 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 421,000 |  |
Principal payment for the year 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 421,000 |  |
Principal payment for the year 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 915,000 |  |
Principal payment for the year 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,164,000 |  |
Principal payment for the year 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,271,000 |  |
Unused and available credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,800,000 |
Bank Guarantees outstanding to customers |  | 1,784,000 | 576,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit |  | 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured long term debt |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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