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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) (USD $) |  | 12 Months Ended |  |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Apr. 30, 2013 Standby letters of credit [Member] | Apr. 30, 2013 Revolving Credit Facility [Member] | Jul. 31, 2009 Revolving Credit Facility [Member] | Apr. 30, 2013 Revolving Credit Facility [Member] Minimum [Member] | Apr. 30, 2013 Revolving Credit Facility [Member] Maximum [Member] | Apr. 30, 2013 Revolving credit facility outstanding [Member] | Apr. 30, 2013 Letter of credit [Member] Bank guarantees outstanding [Member] | Aug. 02, 2010 Secured debt [Member] | Apr. 30, 2013 Secured debt [Member] | Aug. 02, 2012 Secured debt [Member]
Proforma Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility outstanding | $ 2,100,000 | $ 15,000,000 | $ 2,000,000 |  |  | $ 6,700,000 |  | $ 4,000,000 |  |
Credit facility expiration date |  | Jul. 31, 2014 |  |  |  |  | Apr. 30, 2013 |  |  |
Line of credit facility, Interest rate description |  | Monthly interest payments under the facility are payable calculated at the 30-day LIBOR Market Interest Rate plus a variable rate |  |  |  |  |  |  |  |
Debt, variable interest rate |  | 1.575% |  | 1.575% | 2.175% |  |  |  | 1.575% |
Interest rate at period end |  | 1.773% |  |  |  |  |  |  |  |
Term loan duration |  |  |  |  |  |  |  | 7 years |  |
Term loan principal payments |  |  |  |  |  |  |  |  | 17,000 |
Line of credit facility, interest rate description |  |  |  |  |  |  |  |  | Interest calculated at the 30-day LIBOR Market Index Rate |
Interest rate swap, conversion rate |  |  |  |  |  |  |  |  |  | 4.875%
Principal payment for the year 2014 |  |  |  |  |  |  |  |  | 200,000 |
Principal payment for the year 2015 |  |  |  |  |  |  |  |  | 200,000 |
Principal payment for the year 2016 |  |  |  |  |  |  |  |  | 200,000 |
Principal payment for the year 2017 |  |  |  |  |  |  |  |  | 200,000 |
Principal payment for the year 2018 |  |  |  |  |  |  |  |  | $ 2,667,000 |

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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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