Calder Racing Operations (Details) $ in Millions	3 Months Ended
Jun. 30, 2015 USD ($)
Calder Racing [Abstract]
Restructuring and Related Cost, Accelerated Depreciation	$ 2.4
Demolition Expense	$ 0.8

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

No definition available.

Name:	us-gaap_RestructuringReserveAcceleratedDepreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration