Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 16,943	$ 14,191
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	8,381	5,939
Stock-based compensation expense	5,194	4,222
Provision for deferred income taxes	1,354	854
Excess tax benefit from stock-based compensation	(487)	(570)
Other non-cash items	(614)	(694)
Changes in operating assets and liabilities, net of effects of businesses acquired:
Accounts receivable, unbilled receivables, and cost in excess of billings	6,404	1,308
Inventory	(3,215)	1,841
Prepaid income taxes	992	2,483
Prepaid expenses and other current assets	485	(1,196)
Other non-current assets	652	(748)
Accounts payable and accrued expenses	(726)	(3,313)
Deferred revenues and customer advances	(2,594)	(2,215)
Income taxes payable	460	676
Other non-current liabilities	(5,542)	67
Net cash provided by operating activities	27,687	22,845
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired	(70,370)	(29,508)
Sales and maturities of marketable securities		18,025
Purchases of property and equipment	(6,438)	(5,336)
Payments for acquired intangible assets	(50)	(2,375)
Increase in restricted cash	(281)
Net cash used in investing activities	(77,139)	(19,194)
Cash flows from financing activities:
Proceeds from follow-on public stock offering, net		93,945
Proceeds from employee stock plans	1,031	2,188
Excess tax benefit from stock-based compensation	487	570
Payments of deferred offering costs	(30)
Payments of capital lease obligations	(137)	(246)
Net cash provided by financing activities	1,351	96,457
Effect of exchange rate changes on cash and cash equivalents	71	72
Net (decrease) increase in cash and cash equivalents	(48,030)	100,180
Cash and cash equivalents at beginning of period	162,875	56,241
Cash and cash equivalents at end of period	114,845	156,421
Cash paid during the period for:
Interest	26	16
Income taxes	6,621	1,548
Supplemental disclosures-non-cash activities:
Issuance of restricted stock awards to employees	8,306	8,698
Acquisition of intangible assets		495
Capital lease		$ 251