Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2012	May 15, 2012 Apex Systems
Business Acquisition [Line Items]
Purchase Price Allocation, Status	the Company finalized the allocation of the purchase price
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	$ 2,200,000	$ 3,400,000	$ 5,000,000
Business Combination Provisional Information Initial Accounting Incomplete Adjustment, Financial Assets, Net of Taxes		1,900,000	2,900,000
Current assets				172,042,000
Property and equipment				902,000
Goodwill				264,590,000
Identifiable intangible assets				251,555,000
Other				494,000
Total assets acquired				689,583,000
Current liabilities				77,905,000
Other				850,000
Total liabilities assumed				78,755,000
Total purchase price				$ 610,828,000