Change in Carrying Amount of Goodwill and Other Intangibles (Detail)	9 Months Ended
	Jan. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Line Items]
Balance as of April 30, 2018	$ 16,381,639
Write off Club Fortune registration	(43,956)
Current year amortization	(14,981)
Balance as of January 31, 2019	16,322,702
Goodwill
Goodwill and Intangible Assets Disclosure [Line Items]
Balance as of April 30, 2018	14,092,154
Write off Club Fortune registration	0
Current year amortization	0
Balance as of January 31, 2019	14,092,154
Other Intangibles, net
Goodwill and Intangible Assets Disclosure [Line Items]
Balance as of April 30, 2018	2,289,485
Write off Club Fortune registration	(43,956)
Current year amortization	(14,981)
Balance as of January 31, 2019	$ 2,230,548