CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Revenues:      
Total revenues $ 3,030,895 $ 2,782,170 $ 2,619,996
Cost of revenues:      
Total cost of revenues 1,710,972 1,606,743 1,527,250
Gross Profit 1,319,923 1,175,427 1,092,746
Operating expenses:      
Selling, general, and administrative 716,731 669,937 631,978
Research and development 65,546 63,038 60,782
Restructuring Costs 673 30,987 103
Total operating expenses 782,950 763,962 692,863
Income (loss) from operations 536,973 411,465 399,883
Non-operating expenses, net:      
Interest expense 40,279 45,015 50,629
Interest income and miscellaneous expense (1,987) (3,020) (5,728)
Total non-operating expenses, net 38,292 41,995 44,901
Income (loss) before income tax expense (benefit) 498,681 369,470 354,982
Income tax expense (benefit) 90,876 64,394 63,360
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 407,805 305,076 291,622
Net Income (Loss) Attributable to Noncontrolling Interest 200 1,025 707
Net (loss) income $ 407,605 $ 304,051 $ 290,915
Net income (loss) per common share      
Basic $ 4.81 $ 3.59 $ 3.42
Diluted 4.76 3.56 3.39
Cash dividends declared per common share outstanding $ 1.45 $ 1.33 $ 1.21
Service [Member]      
Revenues:      
Total revenues $ 1,628,107 $ 1,486,145 $ 1,399,363
Cost of revenues:      
Cost of Goods and Services Sold 960,770 904,448 881,073
Product [Member]      
Revenues:      
Total revenues 1,402,788 1,296,025 1,220,633
Cost of revenues:      
Cost of Goods and Services Sold $ 750,202 $ 702,295 $ 646,177