Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 11,476	$ 5,253
Adjustments to reconcile net income to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	4,876	4,859
Loss on disposal of fixed assets	0	24
Deal related compensation expense and accretion charges	38	36
Share-based compensation expense associated with equity awards	3,302	2,812
Net change in fair value of contingent and contractual liabilities	(9)	(264)
Deferred income taxes	1,409	618
Other losses (gains)	28	(7)
Changes in assets and liabilities
Accounts receivable	27,551	22,988
Inventories	612	(5,158)
Prepaid expenses and other assets	2,053	744
Accounts payable	(1,558)	1,970
Accrued compensation and other expenses	(11,594)	(11,999)
Income taxes payable	(791)	(114)
Deferred revenue	(9,193)	(3,149)
Net cash provided by operating activities	28,200	18,613
Cash flows from investing activities:
Purchase of marketable securities	(42,506)	(18,081)
Proceeds from maturity of marketable securities	13,798	12,112
Purchase of fixed assets	(1,865)	(2,270)
Purchase of intangible assets	(71)	(110)
Decrease (increase) in deposits	17	(46)
Net cash used in investing activities	(30,627)	(8,395)
Cash flows from financing activities:
Issuance of common stock under stock plans	8	213
Payment of contingent consideration	0	(841)
Treasury stock repurchases	(12,187)	(7,470)
Excess tax benefit from share-based compensation awards	1,431	727
Net cash used in financing activities	(10,748)	(7,371)
Effect of exchange rate changes on cash and cash equivalents	73	(50)
Net (decrease) increase in cash and cash equivalents	(13,102)	2,797
Cash and cash equivalents, beginning of period	102,076	99,930
Cash and cash equivalents, end of period	88,974	102,727
Supplemental disclosures:
Cash paid for income taxes	6,142	3,795
Non-cash transactions:
Transfers of inventory to fixed assets	940	1,781
Additions to property, plant and equipment included in accounts payable	95	3
Gross decrease in contractual liability relating to fair value adjustment	(49)	(49)
Gross increase (decrease) in contingent consideration liability relating to fair value adjustment	$ 40	$ (215)