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Goodwill and Other Intangible Asset Table - Additional Information (Detail) (USD $) | 12 Months Ended
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May 31, 2014 | May 31, 2013 | May 31, 2012
Goodwill And Other Intangible Asset [Line Items] |  |  |
Non-amortizable intangible assets | $ 9,682,000 | $ 6,660,000 |
Amortization expense for intangible assets | 3,797,000 | 2,994,000 | 2,527,000
Estimated amortization expense for period, 2015 | 4,158,000 |  |
Estimated amortization expense for period, 2016 | 3,916,000 |  |
Estimated amortization expense for period, 2017 | 3,770,000 |  |
Estimated amortization expense for period, 2018 | 3,552,000 |  |
Estimated amortization expense for period, 2019 | 2,955,000 |  |
Minimum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Maximum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Licenses |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Non-amortizable intangible assets | 569,000 | 569,000 |
Licenses | Minimum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Licenses | Maximum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Trademarks |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Non-amortizable intangible assets | 7,889,000 | 4,867,000 |
Other Intangible Assets |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Non-amortizable intangible assets | $ 1,224,000 | $ 1,224,000 |
Finite lived intangible assets, useful life | 12 years | 12 years |
Noncompete Agreements |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Patents | Minimum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 5 years |  |
Patents | Maximum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 20 years |  |
Customer Relationships |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 12 years | 12 years |
Customer Relationships | Minimum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 12 years |  |
Customer Relationships | Maximum |  |  |
Goodwill And Other Intangible Asset [Line Items] |  |  |
Finite lived intangible assets, useful life | 20 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date of rights not otherwise specified in the taxonomy having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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