Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2020 |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
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| Effect of Fourth Quarter Events [Line Items] | |||||||||||||
| Revenues | $ 822,991 | $ 774,261 | $ 736,840 | $ 696,803 | $ 768,213 | $ 696,238 | $ 678,961 | $ 638,758 | $ 3,030,895 | $ 2,782,170 | $ 2,619,996 | ||
| Cost of revenues: | |||||||||||||
| Cost of Revenue | 458,931 | 442,908 | 418,173 | 390,960 | 433,497 | 409,241 | 394,297 | 369,708 | 1,710,972 | 1,606,743 | 1,527,250 | ||
| Gross Profit | $ 364,060 | $ 331,353 | $ 318,667 | $ 305,843 | $ 334,716 | $ 286,997 | $ 284,664 | $ 269,050 | 1,319,923 | 1,175,427 | 1,092,746 | ||
| Gross Profit Percentage | 44.20% | 42.80% | 43.20% | 43.90% | 43.60% | 41.20% | 41.90% | 42.10% | |||||
| Restructuring expenses | [1] | 3,143 | 40,708 | 103 | |||||||||
| Net Income (Loss) Attributable to Parent | $ 123,316 | $ 104,930 | $ 94,769 | $ 84,590 | $ 108,745 | $ 47,858 | $ 77,457 | $ 69,991 | $ 407,605 | $ 304,051 | $ 290,915 | ||
| Earnings Per Share, Basic | $ 1.45 | $ 1.24 | $ 1.12 | $ 1.00 | $ 1.29 | $ 0.57 | $ 0.92 | $ 0.83 | $ 4.81 | $ 3.59 | $ 3.42 | ||
| Earnings Per Share, Diluted | $ 1.44 | $ 1.23 | $ 1.11 | $ 0.99 | $ 1.27 | $ 0.56 | $ 0.91 | $ 0.82 | $ 4.76 | $ 3.56 | $ 3.39 | ||
| Operating Expense [Member] | |||||||||||||
| Cost of revenues: | |||||||||||||
| Restructuring expenses | $ 4,840 | $ 26,147 | $ 0 | $ 0 | |||||||||
| Service [Member] | |||||||||||||
| Effect of Fourth Quarter Events [Line Items] | |||||||||||||
| Revenues | $ 429,399 | $ 410,466 | $ 399,174 | $ 389,068 | 393,276 | 368,599 | 364,302 | 359,968 | $ 1,628,107 | $ 1,486,145 | $ 1,399,363 | ||
| Cost of revenues: | |||||||||||||
| Cost of Goods and Services Sold | 248,393 | 247,803 | 234,573 | 230,001 | 232,140 | 227,012 | 222,190 | 223,106 | 960,770 | 904,448 | 881,073 | ||
| Product [Member] | |||||||||||||
| Effect of Fourth Quarter Events [Line Items] | |||||||||||||
| Revenues | 393,592 | 363,795 | 337,666 | 307,735 | 374,937 | 327,639 | 314,659 | 278,790 | 1,402,788 | 1,296,025 | 1,220,633 | ||
| Cost of revenues: | |||||||||||||
| Cost of Goods and Services Sold | 210,538 | 195,105 | 183,600 | 160,959 | $ 201,357 | $ 182,229 | $ 172,107 | $ 146,602 | $ 750,202 | $ 702,295 | $ 646,177 | ||
| Operating Expense [Member] | |||||||||||||
| Cost of revenues: | |||||||||||||
| Restructuring expenses | $ 6 | $ (448) | $ (274) | $ 1,389 | |||||||||
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