Other Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013
Kansas Expanded Lottery Act Contract Privilege [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 5,500
Intangible Gaming Support Items [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	547
JET Autopilot Intellectual Property [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 2,055
Useful life	15 years