Earnings Per Share (Detail) (USD $)	3 Months Ended
Aug. 31, 2013	Sep. 01, 2012
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	$ 1,979,000	$ 734,000
Loss from discontinued operations, net of tax	(11,000)	(87,000)
Net income	1,968,000	647,000
Earnings Per Share, Basic and Diluted [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	462,464	268,564
Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Net income
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	12,127,000	12,772,000
Weighted average shares, diluted (in shares)	14,688,000	15,787,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 0.14	$ 0.05
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.14	$ 0.04
Class B Common Stock
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	2,428,000	2,913,000
Weighted average shares, diluted (in shares)	2,428,000	2,913,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 0.13	$ 0.04
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 0.13	$ 0.04
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.13	$ 0.04
Net income per share, diluted (in dollars per share)	$ 0.13	$ 0.04
Basic
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	1,111	(267)
Net income	1,968	647
Basic \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed basic earnings (losses)	941	(222)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	12,127	12,772
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.14	$ 0.04
Basic \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed basic earnings (losses)	170	(45)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 2,428	$ 2,913
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.13	$ 0.04
Basic \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	1,979	734
Undistributed basic earnings (losses)	1,122	(180)
Basic \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed basic earnings (losses)	951	(149)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.14	$ 0.05
Basic \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed basic earnings (losses)	171	(31)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.13	$ 0.04
Basic \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(868)	(1,001)
Loss from discontinued operations, net of tax	(11)	(87)
Basic \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed basic earnings (losses)	(735)	(831)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.00	$ (0.01)
Basic \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed basic earnings (losses)	(133)	(170)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.00	$ 0.00
Diluted
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	1,111	(267)
Net income	1,968	647
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, diluted (in shares)	12,127	12,772
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 2,428	$ 2,913
Effect of dilutive securities dilutive stock options (in shares)	133	102
Denominator for diluted EPS adjusted for weighted average shares and assumed conversions (in shares)	14,688	15,787
Diluted \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed diluted earnings (losses)	943	(222)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.13	$ 0.04
Diluted \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed diluted earnings (losses)	168	(45)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.13	$ 0.04
Diluted \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	1,979	734
Undistributed diluted earnings (losses)	1,122	(180)
Diluted \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed diluted earnings (losses)	952	(150)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.13	$ 0.05
Diluted \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed diluted earnings (losses)	170	(30)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.13	$ 0.04
Diluted \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(868)	(1,001)
Loss from discontinued operations, net of tax	(11)	(87)
Diluted \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	723	758
Undistributed diluted earnings (losses)	(737)	(832)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.00	$ (0.01)
Diluted \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	134	156
Undistributed diluted earnings (losses)	$ (131)	$ (169)
Earnings Per Share, Basic and Diluted [Abstract]
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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

+ Details

Name:	us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

+ Details

Name:	us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

+ Details

Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration