Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
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ACQUISITIONS: - Components of intangible assets acquired and their estimated useful lives (Details) - USD ($) $ in Thousands		12 Months Ended
	Nov. 29, 2015	Mar. 31, 2018	Nov. 29, 2016
Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Intangible assets (Other assets)	$ 40,800		$ 40,800
Publisher relationships \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Intangible assets (Other assets)	$ 23,800
Weighted Average Useful Life (years)	6 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)		4 years
Developed technology \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Intangible assets (Other assets)	$ 9,300
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)		6 years
Customer relationships \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Intangible assets (Other assets)	$ 7,100
Weighted Average Useful Life (years)	6 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)		3 years
Trade names \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Intangible assets (Other assets)	$ 600
Weighted Average Useful Life (years)	1 year
Minimum \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)		1 year
Minimum \| Developed technology \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	2 years
Maximum \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)		6 years
Maximum \| Developed technology \| Arbor and Circulate
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	4 years