Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 7,669	$ 11,476
Adjustments to reconcile net income to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	4,986	4,876
Loss on disposal of fixed assets	10	0
Deal related compensation expense and accretion charges	37	38
Share-based compensation expense associated with equity awards	4,595	3,302
Net change in fair value of contingent and contractual liabilities	0	(9)
Deferred income taxes	239	1,409
Other losses	42	28
Changes in assets and liabilities
Accounts receivable	23,729	27,551
Inventories	(1,806)	612
Prepaid expenses and other assets	6,654	2,053
Accounts payable	(1,629)	(1,558)
Accrued compensation and other expenses	(20,955)	(11,594)
Income taxes payable	40	(791)
Deferred revenue	(14,321)	(9,193)
Net cash provided by operating activities	9,290	28,200
Cash flows from investing activities:
Purchase of marketable securities	(32,289)	(42,506)
Proceeds from maturity of marketable securities	19,034	13,798
Purchase of fixed assets	(3,415)	(1,865)
Purchase of intangible assets	(88)	(71)
Decrease in deposits	0	17
Net cash used in investing activities	(16,758)	(30,627)
Cash flows from financing activities:
Issuance of common stock under stock plans	0	8
Treasury stock repurchases	(3,167)	(12,187)
Excess tax benefit from share-based compensation awards	0	1,431
Net cash used in financing activities	(3,167)	(10,748)
Effect of exchange rate changes on cash and cash equivalents	94	73
Net decrease in cash and cash equivalents	(10,541)	(13,102)
Cash and cash equivalents, beginning of period	104,893	102,076
Cash and cash equivalents, end of period	94,352	88,974
Supplemental disclosures:
Cash paid for income taxes	2,967	6,142
Non-cash transactions:
Transfers of inventory to fixed assets	1,229	940
Additions to property, plant and equipment included in accounts payable	245	95
Gross decrease in contractual liability relating to fair value adjustment	0	(49)
Gross increase in contingent consideration liability relating to fair value adjustment	$ 0	$ 40