Regulatory Capital Requirements (Schedule Of Net Capital Position Of Southwest Securities) (Detail) (Southwest Securities [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Southwest Securities [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Net Capital, Total	$ 156,423	$ 141,112
Less: required net capital	6,577	6,843
Excess net capital	149,846	134,269
Net capital as a percent of aggregate debit items	47.60%	41.20%
Net capital in excess of 5% aggregate debit items	$ 139,981	$ 124,005