Discontinued Operations - Additional Information (Details) - USD ($)		12 Months Ended
	Jun. 04, 2014	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from disposition	$ 30,000,000			$ 30,000,000
Amount that placed into escrow as partial security for the Company's indemnification obligations	$ 4,500,000
Loss on disposal of discontinued operations, net of tax, recognized in current period		$ 0	$ 0	$ (1,537,000)
Assets held for sale		0
Claims for indemnification received		$ 0