Property and Equipment - Property and Equipment, net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 571,431	$ 537,277
Accumulated depreciation	(311,055)	(256,870)
Total property and equipment, net	260,376	280,407
Land and Buildings [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	83,373	82,991
Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	448,072	419,385
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 39,986	$ 34,901