Consolidated Statements Of Stockholders' Equity (USD $) In Thousands	Common Stock Issued [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at May. 31, 2008	$ 829	$ 0	$ 283,133	$ (173,313)	$ 0	$ 110,649
Balance, shares at May. 31, 2008	82,886	0
Stock-based compensation expense	0	0	5,770	0	0	5,770
Change in net investment from parent, Misys plc	0	0	35,350	0	0	35,350
Issuance of shares of common stock for purchase of Allscripts/Eclipsys	630	0	562,432	0	0	563,062
Issuance of shares of common stock for purchase of Allscripts/Eclipsys, shares	62,998	0
Common stock issued under stock plans	17	0	5,603	0	0	5,620
Common stock issued under stock plans, shares	1,937	0
Excess tax benefit realized upon exercise of stock-based compensation	0	0	5,463	0	0	5,463
Repurchase of shares of common stock	(53)	0	(51,494)	0	0	(51,547)
Repurchase of shares of common stock, shares	(5,424)	0
Net income (loss)	0	0	0	26,022	0	26,022
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	(19)	(19)
Net unrealized (loss) gain on derivative financial instruments, net of tax						0
Foreign currency translation adjustment						0
Balance at May. 31, 2009	1,423	0	846,257	(147,291)	(19)	700,370
Balance, shares at May. 31, 2009	142,397	0
Stock-based compensation expense	0	0	13,918	0	0	13,918
Common stock issued under stock plans	16	0	3,578	0	0	3,594
Common stock issued under stock plans, shares	1,519	0
Excess tax benefit realized upon exercise of stock-based compensation	0	0	6,251	0	0	6,251
Conversion of debentures	25	0	19,734	0	0	19,759
Conversion of debentures, shares	2,451	0
Net income (loss)	0	0	0	62,870	0	62,870
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	63	63
Net unrealized (loss) gain on derivative financial instruments, net of tax						0
Foreign currency translation adjustment						0
Balance at May. 31, 2010	1,464	0	889,738	(84,421)	44	806,825
Balance, shares at May. 31, 2010	146,367	0
Stock-based compensation expense	0	0	17,968	0	0	17,968
Issuance of shares of common stock for purchase of Allscripts/Eclipsys	692	0	1,230,590	0	0	1,231,282
Issuance of shares of common stock for purchase of Allscripts/Eclipsys, shares	69,226	0
Common stock issued under stock plans	35	0	10,391	0	0	10,426
Common stock issued under stock plans, shares	3,565	0
Excess tax benefit realized upon exercise of stock-based compensation	0	0	(457)	0	0	(457)
Issuance and receipt of shares of common stock related to the Coniston Transactions	613	(613)	0	0	0	0
Issuance and receipt of shares of common stock related to the Coniston Transactions, shares	61,308	(61,308)
Repurchase of shares of common stock related to the Coniston Transactions	(297)	0	(678,703)	0	0	(679,000)
Repurchase of shares of common stock related to the Coniston Transactions, shares	(29,756)	0
Net income (loss)	0	0	0	(5,565)	0	(5,565)
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	(1)	(1)
Net unrealized (loss) gain on derivative financial instruments, net of tax	0	0	0	0	1,227	1,227
Foreign currency translation adjustment	0	0	0	0	1,063	1,063
Balance at Dec. 31, 2010	2,507	(613)	1,469,527	(89,986)	2,333	1,383,768
Balance, shares at Dec. 31, 2010	250,710	(61,308)
Stock-based compensation expense	0	0	41,199	0	0	41,199
Common stock issued under stock plans	40	0	23,623	0	0	23,663
Common stock issued under stock plans, shares	3,981	0
Excess tax benefit realized upon exercise of stock-based compensation	0	0	8,818	0	0	8,818
Repurchase of shares of common stock	0	(51,462)	0	0	0	(51,462)
Repurchase of shares of common stock, shares		(2,643)
Net income (loss)	0	0	0	73,609	0	73,609
Unrealized gain (loss) on marketable securities, net of tax	0	0	0	0	(3)	(3)
Net unrealized (loss) gain on derivative financial instruments, net of tax	0	0	0	0	(2,294)	(2,294)
Foreign currency translation adjustment	0	0	0	0	(578)	(578)
Balance at Dec. 31, 2011	$ 2,547	$ (52,075)	$ 1,543,167	$ (16,377)	$ (542)	$ 1,476,720
Balance, shares at Dec. 31, 2011	254,691	(63,951)