CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 1,588	$ 1,408
Accumulated depreciation and amortization	156,730	125,706
Accumulated amortization	$ 503,130	$ 446,447
Preferred stock par value per share	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock par value per share	$ 0.01	$ 0.01
Common stock shares authorized	95,000,000	95,000,000
Common stock shares issued	57,213,615	56,598,045
Common stock shares outstanding	54,999,436	55,051,673
Treasury stock shares	2,214,179	1,546,372