Debt, Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
Debt, Interest Expense (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Interest Expense [Abstract]
Interest expense	$ 9.0	$ 10.2		$ 27.9	$ 30.6
Amortization of deferred financing costs	$ 1.0	$ 0.9		$ 2.8	$ 2.6
Credit Agreement [Member] \| Term Loan [Member]
Interest Expense [Abstract]
Margin rate				3.50%
Credit Agreement [Member] \| Term Loan [Member] \| LIBOR [Member]
Interest Expense [Abstract]
Interest rate floor				1.00%
Credit Agreement [Member] \| Revolver [Member]
Interest Expense [Abstract]
Margin rate				3.25%
Credit Agreement [Member] \| LC Facility [Member]
Interest Expense [Abstract]
Margin rate				4.50%
Fourth Amendment [Member] \| Term Loan [Member] \| Base Rate [Member]
Interest Expense [Abstract]
Margin rate				3.00%
Fourth Amendment [Member] \| Term Loan [Member] \| Eurodollar [Member]
Interest Expense [Abstract]
Margin rate				4.00%
Fifth Amendment [Member] \| Term Loan [Member] \| Base Rate [Member]
Interest Expense [Abstract]
Margin rate			2.50%
Fifth Amendment [Member] \| Term Loan [Member] \| Eurodollar [Member]
Interest Expense [Abstract]
Margin rate			3.50%
Fifth Amendment [Member] \| Revolver [Member]
Interest Expense [Abstract]
Secured debt leverage ratio			4.5
Fifth Amendment [Member] \| Revolver [Member] \| Base Rate [Member] \| Maximum [Member]
Interest Expense [Abstract]
Margin rate			2.50%
Fifth Amendment [Member] \| Revolver [Member] \| Base Rate [Member] \| Minimum [Member]
Interest Expense [Abstract]
Margin rate			2.25%
Fifth Amendment [Member] \| Revolver [Member] \| Eurodollar [Member] \| Maximum [Member]
Interest Expense [Abstract]
Margin rate			3.50%
Fifth Amendment [Member] \| Revolver [Member] \| Eurodollar [Member] \| Minimum [Member]
Interest Expense [Abstract]
Margin rate			3.25%
Third Amendment [Member] \| Revolver [Member]
Interest Expense [Abstract]
Secured debt leverage ratio				4.5
Third Amendment [Member] \| Revolver [Member] \| Base Rate [Member] \| Maximum [Member]
Interest Expense [Abstract]
Margin rate				2.75%
Third Amendment [Member] \| Revolver [Member] \| Base Rate [Member] \| Minimum [Member]
Interest Expense [Abstract]
Margin rate				2.50%
Third Amendment [Member] \| Revolver [Member] \| Eurodollar [Member] \| Maximum [Member]
Interest Expense [Abstract]
Margin rate				3.75%
Third Amendment [Member] \| Revolver [Member] \| Eurodollar [Member] \| Minimum [Member]
Interest Expense [Abstract]
Margin rate				3.50%

Intrawest Resorts Holdings, Inc. 10-Q