Note 10 - Share-based Employee Compensation (Details Textual)
$ / shares in Units, $ in Millions |
|
3 Months Ended |
12 Months Ended |
|
May 31, 2016
USD ($)
shares
|
Aug. 30, 2016
USD ($)
$ / shares
shares
|
Sep. 01, 2015
USD ($)
|
May 31, 2016
USD ($)
shares
|
| SIP and 1996 SIP [Member] | Employee Stock Option [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |
|
4,444,000
|
|
|
| SIP and 1996 SIP [Member] | Restricted Stock Service-based [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
|
3 years
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |
|
7 years
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
|
809,000
|
|
|
| SIP and 1996 SIP [Member] | Restricted Stock Units Service-based [Member] | Cliff Vest [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
|
3 years
|
|
|
| Number Of Annual Installments |
|
3
|
|
|
| SIP and 1996 SIP [Member] | Restricted Stock Units Service-based [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
|
286,000
|
|
|
| SIP and 1996 SIP [Member] | Stock Options Performance-based [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
|
571,000
|
|
|
| SIP and 1996 SIP [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
|
3 years
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |
|
7 years
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |
|
6,726,000
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
|
2,282,000
|
|
|
| Employee Stock Option [Member] |
|
|
|
|
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ |
$ 1.1
|
|
|
$ 1.1
|
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |
1 year 328 days
|
|
|
|
| Restricted Stock Service-based [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
|
292,000
|
|
|
| Restricted Stock Units (RSUs) [Member] |
|
|
|
|
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ |
|
$ 2.5
|
|
|
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |
|
1 year 219 days
|
|
|
| Stock Options Performance-based [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |
|
4 years 25 days
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |
|
2,785,000
|
|
|
| Other Deferred Liabilities [Member] |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $ |
|
$ 0.4
|
|
$ 0.2
|
| Preferred Stock, Shares Issued |
0
|
0
|
|
0
|
| Preferred Stock, Shares Authorized |
|
250,000
|
|
|
| Preferred Stock, Par or Stated Value Per Share | $ / shares |
|
$ 0.01
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | $ |
|
$ 0.9
|
$ 0.3
|
|