Segment Information - Reconciliation of Reportable Segment Assets to Corresponding Consolidated Amounts (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Sep. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 682,321	$ 759,654
Cash, cash equivalents and marketable securities	72,201	214,030
Deferred tax assets	5,083	89,959
Assets held for sale	2,806	2,900
Equity method investments	26,510	24,286
Other unallocated corporate net assets	0	500
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 575,721	$ 427,979