Supplementary Balance Sheet Information Changes in Goodwill Amount (Details) - USD ($) $ in Thousands	9 Months Ended
Apr. 30, 2017	Jul. 31, 2016	Apr. 30, 2016
Goodwill [Line Items]
Balance at July 31, 2016	$ 1,430,008	$ 509,037	$ 509,083
Whistler Blackcomb acquisition	956,876
Effects of changes in foreign currency exchange rates	(35,905)
Mountain [Member]
Goodwill [Line Items]
Balance at July 31, 2016	1,362,109	441,138
Effects of changes in foreign currency exchange rates	(35,905)
Lodging [Member]
Goodwill [Line Items]
Balance at July 31, 2016	67,899	$ 67,899
Whistler Blackcomb acquisition	0
Effects of changes in foreign currency exchange rates	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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