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Updates to Critical Accounting Policies and Estimates - Additional Information (Detail) - Segments [Domain] $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended |
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Nov. 30, 2013 USD ($) | May. 30, 2015 USD ($) Vote $ / shares shares | May. 31, 2014 USD ($) $ / shares shares | Jun. 01, 2013 USD ($) $ / shares shares | May. 28, 2011 USD ($)
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Warranty Period Minimum |  | 1 year |  |  |
Business Acquisition, Transaction Costs |  |  |  |  | $ 238,800
Impairment of goodwill | $ 1,671 | $ 0 | $ 1,671 | $ 0 |
Common Stock, Shares Authorized | shares |  | 17,000,000 |  |  |
Allowance for Doubtful Accounts Receivable, Current |  | $ 283 | 581 |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 200 | 100 | 800 |
Finished Goods Included in inventories |  | 33,700 | 30,900 |  |
Raw material and Work in progress included in inventories |  | 5,100 |  | 3,000 |
Inventory Write-down |  | 3,000 | 3,100 |  |
Inventory Valuation Reserves |  | 200 | 800 | 400 |
Investments |  | 34,700 | 32,700 |  |
Investments - current |  | 23,692 | 31,732 |  |
Other Long-term Investments |  | 10,900 | 1,000 |  |
Available-for-sale Securities, Equity Securities, Noncurrent |  | 600 | 500 |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  | 200 | 0 | 200 |
Depreciation |  | 1,700 | 1,000 | 1,000 |
Goodwill |  | 0 | 0 | 1,519 |
Other non-current liabilities |  | 1,221 | 1,315 |  |
Share-based Compensation |  | $ 726 | $ 759 | $ 619 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 5 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 6 years 6 months |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares |  | 47,000 | 32,000 | 31,000 |
Proceeds from Stock Options Exercised |  | $ 300 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 200 | $ 200 | $ 100 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 3.71 | $ 4.53 | $ 4.75 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 2,100 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 5 years |  | 10 years 1 month |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  | $ 700 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 880,589 | 489,064 | 280,764 |
Warranty Term Maximum |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments |  | $ 100 | $ 0 | $ 0 |
Available-for-sale Equity Securities, Gross Unrealized Loss |  | $ 100 | $ 100 | $ 100 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 10 years |  |  |
Two Thousand Eleven Stock Incentive Compensation Plan [Member] |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance | shares |  | 187,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 5 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |
Two Thousand Eleven Stock Incentive Compensation Plan [Member] | Maximum [Member] |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 750,000 |  |  |
Stock Option Plan Twenty Zero Six [Member] |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance | shares |  | 65,000 |  |  |
Stock Option Plan Twenty Zero Six [Member] | Maximum [Member] |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares |  | 400,000 |  |  |
Common Stock |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares |  | 47,000 | 32,000 | 31,000 |
Class B Common Stock |  |  |  |  |
Update Of Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Common Stock, Shares Authorized | shares |  | 3,000,000 |  |  |
Number Of Votes For Class B Common Stock | Vote |  | 10 |  |  |
Cash Dividends Class Common Stock Percentage |  | 90.00% |  |  |

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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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