CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Product	$ 267,285	$ 252,616	$ 754,570	$ 710,853
Service	205,959	152,935	594,046	446,112
Total revenues	473,244	405,551	1,348,616	1,156,965
Cost of revenues:
Product	150,164	144,884	423,130	408,051
Service	125,924	96,892	364,245	283,787
Total cost of revenues	276,088	241,776	787,375	691,838
Gross Profit	197,156	163,775	561,241	465,127
Operating expenses:
Selling, general, and administrative	122,370	95,497	362,350	280,087
Research and development	14,549	11,580	39,964	36,960
Restructuring expenses	(1,109)	808	(10)	878
Total operating expenses	135,810	107,885	402,304	317,925
Income (loss) from operations	61,346	55,890	158,937	147,202
Non-operating expenses, net:
Interest expense	4,822	4,672	14,452	14,527
Interest income and miscellaneous expense	(417)	(241)	(673)	(715)
Total non-operating expenses, net	4,405	4,431	13,779	13,812
Income (loss) before income tax expense (benefit)	56,941	51,459	145,158	133,390
Income tax expense (benefit)	18,817	22,953	51,493	42,824
Net (loss) income	$ 38,124	$ 28,506	$ 93,665	$ 90,566
Net income (loss) per common share
Basic	$ 0.64	$ 0.48	$ 1.58	$ 1.54
Diluted	$ 0.63	$ 0.48	$ 1.56	$ 1.52
Cash dividends declared per common share outstanding	$ 0.23	$ 0.21	$ 0.67	$ 0.61