FAIR VALUE MEASUREMENTS: (Tables)
 6 Months Ended
May 31, 2014
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, 2014
 
As of November 30, 2013
 
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
$
34,975

 
$
34,975

 
$
—

 
$
—

 
$
28,779

 
$
28,779

 
$
—

 
$
—

Trading securities
1,828

 
1,828

 
—

 
—

 
4,728

 
4,728

 
—

 
—

Available-for-sale securities in other assets
1,602

 
1,602

 
—

 
—

 
1,275

 
1,275

 
—

 
—

Forward foreign currency exchange contracts
247

 
—

 
247

 
—

 
2,386

 
—

 
2,386

 
—

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Forward foreign currency exchange contracts
$
2,082

 
$
—

 
$
2,082

 
$
—

 
$
80

 
$
—

 
$
80

 
$
—

Acquisition-related contingent consideration
867

 
—

 
—

 
867

 
6,077

 
—

 
—

 
6,077