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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) shares | May 31, 2019 USD ($) shares | Dec. 31, 2017 | Dec. 22, 2017 | Dec. 29, 2017 | May 31, 2020 USD ($) $ / shares | May 31, 2019 USD ($) $ / shares | May 31, 2018 USD ($) $ / shares | Jun. 01, 2019 USD ($) | May 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Stock split ratio |  |  |  |  | 1.33 |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 9 years | 10 years |  |  |
Federal corporate tax rate |  |  |  | 35.00% |  | 21.00% | 21.00% | 21.00% |  |
Products and services, payment terms |  |  |  |  |  | 30 to 60 days |  |  |  |
Commercial Paper | $ 260,556,000 |  |  |  |  | $ 260,556,000 |  |  |  |
Short-term domestic certificates of deposit | 16,848,000 |  |  |  |  | 16,848,000 |  |  |  |
Marketable securities | 277,404,000 | $ 225,836,000 |  |  |  | 277,404,000 | $ 225,836,000 |  |  |
Valuation allowance for inventory | 2,850,000 | 2,250,000 |  |  |  | 2,850,000 | 2,250,000 |  |  |
Depreciation expense |  |  |  |  |  | 11,907,000 | 11,315,000 | $ 10,315,000 |  |
Cost of goods and services sold |  |  |  |  |  | $ 221,891,000 | $ 222,266,000 | $ 211,658,000 |  |
Weighted-average fair value per share of stock options granted | $ / shares |  |  |  |  |  | $ 15.56 | $ 14.91 | $ 14.47 |  |
Cash held at foreign subsidiaries | 13,060,000 | 8,711,000 |  |  |  | $ 13,060,000 | $ 8,711,000 |  |  |
Cash and cash equivalents | $ 66,269,000 | $ 41,688,000 |  |  |  | 66,269,000 | 41,688,000 | $ 83,074,000 |  | $ 77,567,000
Shares excluded from computations of diluted net income per share | shares | 28,000 | 5,000 |  |  |  |  |  |  |  |
Operating lease right of use asset | $ 1,952,000 |  |  |  |  | 1,952,000 |  |  | $ 2,000,000.0 |
Operating lease liability | $ 1,982,000 |  |  |  |  | $ 1,982,000 |  |  | $ 2,000,000.0 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OperatingLeaseLiabilityCurrent |  |  |  |  | us-gaap:OperatingLeaseLiabilityCurrent |  |  | us-gaap:OperatingLeaseLiabilityCurrent |
Operating lease payments |  |  |  |  |  | $ 1,178,000 |  |  |  |
Right of use assets in exchange of lease liability |  |  |  |  |  | 0 |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  | 0 | 0 | 0 |  |
Impairments of long-lived assets |  |  |  |  |  | 0 | 0 | 0 |  |
Future minimum rental payments for 2020 |  | $ 1,112,000 |  |  |  |  | 1,112,000 |  |  |
Future minimum rental payments for 2021 |  | 810,000 |  |  |  |  | 810,000 |  |  |
Future minimum rental payments for 2022 |  | 297,000 |  |  |  |  | 297,000 |  |  |
Future minimum rental payments for 2023 |  | $ 101,000 |  |  |  |  | 101,000 |  |  |
Shipping and Handling |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  | 13,514,000 | 13,503,000 | 12,147,000 |  |
Advertising Cost |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  |  |  | $ 1,454,000 | $ 1,471,000 | $ 1,411,000 |  |
Customer One |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Account receivable percentage from major customer |  |  |  |  |  | 10.00% | 10.00% |  |  |
Latin America |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of ownership in subsidiaries | 100.00% | 100.00% |  |  |  | 100.00% | 100.00% |  |  |
Percentage of ownership in subsidiaries before capital contribution |  |  | 90.00% |  |  |  |  |  |  |
Percentage of ownership in subsidiaries Before capital contribution |  |  | 100.00% |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Marketable securities, maturity period |  |  |  |  |  | 91 days |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 5 years |  |  |  |
Minimum | Buildings And Improvements |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  | 7 years | 7 years | 7 years |  |
Minimum | Furniture, fixtures, machinery and equipment |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Marketable securities, maturity period |  |  |  |  |  | 2 years |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 25 years |  |  |  |
Maximum | Buildings And Improvements |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  | 39 years | 39 years | 39 years |  |
Maximum | Furniture, fixtures, machinery and equipment |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  | 10 years |  |  |  |

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