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Note 1 - Organization, Basis of Presentation, and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Feb. 26, 2017
Notes Tables  
Schedule of Effect of Significant Unobservable Inputs for Investment [Table Text Block]
   
February 26, 2017
   
May 29, 2016
 
Revenue growth rates
   
4%
     
4%
 
Expense growth rates
   
4%
     
4%
 
Income tax rates
   
15%
     
15%
 
Discount rates
   
12%
     
12.5%
 
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]
   
Impact on value of
investment in
Windset
as of
February 26, 2017
 
10% increase in revenue growth rates
  $
7,200
 
10% increase in expense growth rates
  $
(2,100
)
10% increase in income tax rates
  $
(400
)
10% increase in discount rates
  $
(4,300
)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Fair Value at
February 26, 2017
   
Fair Value at May 29, 2016
 
Assets:  
Level 1
   
Level 2
   
Level 3
   
Level 1
   
Level 2
   
Level 3
 
Interest rate swap
(1)
  $
    $
681
    $
    $
    $
    $
 
Investment in
non-public company
   
     
     
63,400
     
     
     
62,700
 
Total
  $
    $
681
    $
63,400
    $
    $
    $
62,700
 
Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]
   
Three Months Ended
   
Nine
Months Ended
 
   
February 26,
2017
   
February 28,
2016
   
February 26,
2017
   
February 28,
2016
 
Recorded upon shipment
  $
125,765
    $
118,789
    $
339,917
    $
341,914
 
Recorded upon acceptance in foreign port
   
7,276
     
6,389
     
56,316
     
50,873
 
Revenue from multiple element arrangements
   
2,624
     
4,025
     
5,892
     
9,672
 
Revenue from license fees, R&D contracts and royalties/profit sharing
   
903
     
787
     
2,702
     
3,327
 
Total
  $
136,568
    $
129,990
    $
404,827
    $
405,786