FAIR VALUE MEASUREMENTS: (Tables)
6 Months Ended
May. 31, 2015
Fair Value Disclosures [Abstract]  
Schedule of valuation of investments and financial instruments measured at fair value on recurring basis
The following table summarizes the valuation of the Company’s investments and financial instruments that are measured at fair value on a recurring basis:  
 
As of May 31, 2015
 
As of November 30, 2014
 
Total
 
Fair value measurement category
 
Total
 
Fair value measurement category
 
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cash equivalents
$
54,822

 
$
54,822

 
$

 
$

 
$
29,823

 
$
29,823

 
$

 
$

Restricted cash
27,517

 
27,517

 

 

 
34,269

 
34,269

 

 

Trading securities

 

 

 

 
1,987

 
1,987

 

 

Available-for-sale securities
2,230

 
2,230

 

 

 
1,740

 
1,740

 

 

Forward foreign currency exchange contracts
2,057

 

 
2,057

 

 
4,532

 

 
4,532

 

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Forward foreign currency exchange contracts
$
202

 
$

 
$
202

 
$

 
$
145

 
$

 
$
145

 
$

Interest rate swaps
1,887

 

 
1,887

 

 

 

 

 

Acquisition-related contingent consideration
433

 

 

 
433

 
867

 

 

 
867