Supplementary Financial Data (Unaudited) (Tables)

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

Selected Unaudited Consolidated Financial Results

The following table presents selected unaudited consolidated financial results for each of the eight quarters in the two-year period ended September 30, 2015. 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, 2015		June 30, 2015		March 31, 2015		December 31, 2014
	(In thousands, except per share data)
Revenues	$	232,756	$	209,366	$	207,109	$	189,550
Cost of revenues (1)	67,042		66,202		70,991		66,300
Gross profit	165,714		143,164		136,118		123,250
Net income	$	33,319	$	19,906	$	18,870	$	14,407
Earnings per share (2):
Basic	$	1.07	$	0.64	$	0.60	$	0.45
Diluted	$	1.03	$	0.62	$	0.58	$	0.43
Shares used in computing earnings per share:
Basic	31,214		31,118		31,335		31,936
Diluted	32,494		32,363		32,448		33,128

	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 (1)	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 (2):
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

(1) Cost of revenues excludes amortization expense of $1.9 million, $1.9 million, $1.9 million, $1.8 million, $1.9 million, $1.9 million, $1.8 million and $1.8 million for the quarters ended September 30, 2015, June 30, 2015, March 31, 2015, December 31, 2014, September 30, 2014, June 30, 2014, March 31, 2014 and December 31, 2013, respectively.

(2) 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.