CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Product	$ 252,616	$ 243,722	$ 710,853	$ 689,125
Service	152,935	136,683	446,112	384,561
Total revenues	405,551	380,405	1,156,965	1,073,686
Cost of revenues:
Product	144,884	139,683	408,051	392,311
Service	96,892	87,600	283,787	237,880
Total cost of revenues	241,776	227,283	691,838	630,191
Gross Profit	163,775	153,122	465,127	443,495
Operating expenses:
Selling, general, and administrative	95,497	75,953	280,087	236,767
Research and development	11,580	10,415	36,960	29,579
Restructuring expenses	808	(386)	878	(570)
Total operating expenses	107,885	85,982	317,925	265,776
Income (loss) from operations	55,890	67,140	147,202	177,719
Non-operating expenses, net:
Interest expense	4,672	4,207	14,527	10,586
Interest income and miscellaneous expense	(241)	(338)	(715)	(629)
Total non-operating expenses, net	4,431	3,869	13,812	9,957
Income (loss) before income tax expense (benefit)	51,459	63,271	133,390	167,762
Income tax expense (benefit)	22,953	15,174	42,824	49,166
Net (loss) income	$ 28,506	$ 48,097	$ 90,566	$ 118,596
Net income (loss) per common share
Basic	$ 0.48	$ 0.82	$ 1.54	$ 2.04
Diluted	$ 0.48	$ 0.82	$ 1.52	$ 2.02
Cash dividends declared per common share outstanding	$ 0.21	$ 0.19	$ 0.61	$ 0.55