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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 29, 2017 | May 31, 2021 USD ($) $ / shares shares | May 31, 2020 USD ($) $ / shares shares | May 31, 2019 USD ($) $ / shares shares | Jun. 01, 2019 USD ($) | May 31, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock split ratio | 1.33 |  |  |  |  |
Finite lived intangible assets, useful life |  | 10 years | 9 years |  |  |
Products and services, payment terms |  | 30 to 60 days |  |  |  |
Commercial Paper |  | $ 299,700,000 |  |  |  |
Short-term domestic certificates of deposit |  | 5,785,000 |  |  |  |
Marketable securities |  | 305,485,000 | $ 277,404,000 |  |  |
Valuation allowance for inventory |  | 3,100,000 | 2,850,000 |  |  |
Depreciation expense |  | 13,288,000 | 11,907,000 | $ 11,315,000 |  |
Cost of goods and services sold |  | $ 253,403,000 | $ 221,891,000 | $ 222,266,000 |  |
Weighted-average fair value per share of stock options granted | $ / shares |  | $ 7.71 | $ 7.78 | $ 7.46 |  |
Cash held at foreign subsidiaries |  | $ 15,246,000 | $ 13,060,000 |  |  |
Cash and cash equivalents |  | $ 75,602,000 | $ 66,269,000 | $ 41,688,000 |  | $ 83,074,000
Shares excluded from computations of diluted net income per share | shares |  | 0 | 56,000 | 10,000 |  |
Operating lease right of use asset |  | $ 2,477,000 | $ 1,952,000 |  | $ 2,000,000.0 |
Operating lease liability |  | 2,492,000 |  |  | $ 2,000,000.0 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  |  |  | us-gaap:OperatingLeaseLiabilityCurrent |
Operating lease payments |  | 1,397,000 | 1,178,000 | $ 1,633,000 |  |
Right of use assets in exchange of lease liability |  | 0 |  |  |  |
Goodwill, Impairment Loss |  | 0 | 0 | 0 |  |
Impairments of long-lived assets |  | $ 0 | $ 0 | $ 0 |  |
Weighted-Average Exercise Price, Exercised | $ / shares |  | $ 24.38 | $ 20.12 | $ 15.64 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Weighted-Average Exercise Price, Exercised | $ / shares |  | $ 34.21 |  |  |  |
Shipping and Handling |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cost of goods and services sold |  | $ 15,180,000 | $ 13,514,000 | $ 13,503,000 |  |
Advertising Cost |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cost of goods and services sold |  | $ 1,687,000 | $ 1,454,000 | $ 1,471,000 |  |
Customer One |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Account receivable percentage from major customer |  | 10.00% | 10.00% |  |  |
Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Marketable securities, maturity period |  | 91 days |  |  |  |
Finite lived intangible assets, useful life |  | 5 years |  |  |  |
Stock option vesting period |  | 3 years |  |  |  |
Minimum | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock option vesting period |  | 3 years |  |  |  |
Minimum | Buildings And Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 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 |  |  |  |
Stock option vesting period |  | 5 years |  |  |  |
Maximum | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock option vesting period |  | 5 years |  |  |  |
Maximum | Buildings And Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 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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