Goodwill and Net Other Intangibles by Segment (Detail)	Jan. 31, 2019 USD ($)
Goodwill [Line Items]
Goodwill and other intangible assets	$ 16,322,702
Washington
Goodwill [Line Items]
Goodwill and other intangible assets	15,954,154
Corporate
Goodwill [Line Items]
Goodwill and other intangible assets	368,548
Other Intangibles, net
Goodwill [Line Items]
Goodwill and other intangible assets	2,230,548
Other Intangibles, net | Washington
Goodwill [Line Items]
Goodwill and other intangible assets	1,862,000
Other Intangibles, net | Corporate
Goodwill [Line Items]
Goodwill and other intangible assets	368,548
Goodwill
Goodwill [Line Items]
Goodwill and other intangible assets	14,092,154
Goodwill | Washington
Goodwill [Line Items]
Goodwill and other intangible assets	14,092,154
Goodwill | Corporate
Goodwill [Line Items]
Goodwill and other intangible assets	$ 0