Supplementary Balance Sheet Information Changes in Goodwill Amount (Details) - USD ($) $ in Thousands |
6 Months Ended | ||
|---|---|---|---|
Jan. 31, 2017 |
Jul. 31, 2016 |
Jan. 31, 2016 |
|
| Goodwill [Line Items] | |||
| Balance at July 31, 2016 | $ 1,469,756 | $ 509,037 | $ 506,957 |
| Whistler Blackcomb acquisition | 956,086 | ||
| Effects of changes in foreign currency exchange rates | 4,633 | ||
| Mountain [Member] | |||
| Goodwill [Line Items] | |||
| Balance at July 31, 2016 | 1,401,857 | 441,138 | |
| Effects of changes in foreign currency exchange rates | 4,633 | ||
| 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 |