CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Product	$ 213,753	$ 202,013
Service	123,207	116,626
Total revenues	336,960	318,639
Cost of revenues:
Product	125,482	117,433
Service	74,226	68,281
Total cost of revenues	199,708	185,714
Gross Profit	137,252	132,925
Operating expenses:
Selling, general, and administrative	79,774	77,009
Research and development	9,312	8,757
Restructuring expenses	(136)	258
Total operating expenses	88,950	86,024
Income (loss) from operations	48,302	46,901
Non-operating expenses, net:
Interest expense	2,972	2,997
Interest income and miscellaneous expense	260	(107)
Total non-operating expenses, net	(2,712)	(3,104)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	45,590	43,797
Income tax expense (benefit)	15,236	15,066
Net (loss) income	$ 30,354	$ 28,731
Net income (loss) per common share
Basic	$ 0.52	$ 0.48
Diluted	$ 0.52	$ 0.48
Cash dividends declared per common share outstanding	$ 0.17	$ 0.15