Acquisitions (Schedule Of Allocation Of Purchase Price To Assets Acquired And Liabilities Assumed) (Details) (USD $)	Mar. 03, 2011
Gross contractual receivables	$ 21,461,000
Goodwill for assembled workforce	7,900,000
Purchase Price At Acquisitions [Member]
Accounts receivable (gross contractual receivables total of $21,461)	20,569,000
Inventories	6,800,000
Net deferred tax assets	7,552,000
Other current assets	1,606,000
Goodwill (including $7.9 million for assembled workforce)	131,167,000
Intangibles assets	85,600,000
Property, plant and equipment	10,060,000
Other assets	3,235,000
Accounts payable	(6,818,000)
Payroll and related expenses	(531,000)
Deferred revenue	(11,616,000)
Accrued expenses	(11,231,000)
Deferred tax liabilities	(35,370,000)
Long-term deferred revenue	(4,282,000)
Other long-term liabilities	(370,000)
Total net assets acquired	196,371,000
Adjustments To Purchase Price [Member]
Inventories	720,000
Net deferred tax assets	328,000
Other current assets	5,747,000
Goodwill (including $7.9 million for assembled workforce)	8,995,000
Intangibles assets	(18,100,000)
Property, plant and equipment	(937,000)
Other assets	(3,098,000)
Payroll and related expenses	(8,281,000)
Deferred revenue	680,000
Accrued expenses	2,492,000
Deferred tax liabilities	12,800,000
Other long-term liabilities	(1,000,000)
Total net assets acquired	346,000
Adjusted Purchase Price [Member]
Accounts receivable (gross contractual receivables total of $21,461)	20,569,000
Inventories	7,520,000
Net deferred tax assets	7,880,000
Other current assets	7,353,000
Goodwill (including $7.9 million for assembled workforce)	140,162,000
Intangibles assets	67,500,000
Property, plant and equipment	9,123,000
Other assets	137,000
Accounts payable	(6,818,000)
Payroll and related expenses	(8,812,000)
Deferred revenue	(10,936,000)
Accrued expenses	(8,739,000)
Deferred tax liabilities	(22,570,000)
Long-term deferred revenue	(4,282,000)
Other long-term liabilities	(1,370,000)
Total net assets acquired	$ 196,717,000