Supplementary Financial Data (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2014

Quarterly Financial Information Disclosure [Abstract]

Selected Unaudited Consolidated Financial Results

In the opinion of management, this unaudited information has been prepared on the same basis as the audited information and includes all adjustments (consisting of only normal recurring adjustments, except as noted below) necessary for a fair statement of the consolidated financial information for the period presented.

	Quarter Ended
	September 30, 2014		June 30, 2014		March 31, 2014		December 31, 2013
	(In thousands, except per share data)
Revenues	$	221,570	$	197,610	$	185,462	$	184,343
Cost of revenues (2)	71,026		62,752		58,183		57,319
Gross profit	150,544		134,858		127,279		127,024
Net income	$	36,603	$	20,548	$	20,751	$	16,977
Earnings per share (1):
Basic	$	1.14	$	0.60	$	0.60	$	0.49
Diluted	$	1.10	$	0.58	$	0.59	$	0.47
Shares used in computing earnings per share:
Basic	32,123		34,210		34,500		34,699
Diluted	33,217		35,162		35,311		35,820

	Quarter Ended
	September 30, 2013		June 30, 2013		March 31, 2013		December 31, 2012
	(In thousands, except per share data)
Revenues	$	190,327	$	183,772	$	179,325	$	190,020
Cost of revenues (2)	56,809		57,655		58,856		56,148
Gross profit	133,518		126,117		120,469		133,872
Net income	$	28,557	$	19,622	$	18,495	$	23,421
Earnings per share (1):
Basic	$	0.81	$	0.55	$	0.52	$	0.67
Diluted	$	0.79	$	0.54	$	0.51	$	0.65
Shares used in computing earnings per share:
Basic	35,132		35,499		35,664		35,043
Diluted	36,151		36,385		36,492		36,151

(1) Earnings per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the totals for the respective years.

(2) Cost of revenues excludes amortization expense of $1.9 million, $1.9 million, $1.8 million, $1.8 million, $1.7 million, $1.7 million, $1.7 million and $1.5 million for the quarters ended September 30, 2014, June 30, 2014, March 31, 2014, December 31, 2013, September 30, 2013, June 30, 2013, March 31, 2013 and December 31, 2012, respectively.