Segment Information Reconciliation of Reportable Segment Assets to Corresponding Consolidated Amounts (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	$ 796,005	$ 736,763
Investments in cash, cash equivalents, restricted cash and marketable securities	243,754	173,539
Deferred tax assets	85,076	115,985
Assets held for sale	0	27,778
Investments in joint ventures	30,760	25,687
Other unallocated corporate net assets	3,916	2,032
Total assets	796,005	736,763
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Segment assets	432,499	391,742
Total assets	$ 432,499	$ 391,742