Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
Balance | | | $ 436,083 | |
Reclassifications from OCI to: | | | | |
Other income | $ (819) | $ (778) | (1,443) | $ (884) |
Revenue | (305,520) | (248,174) | (605,551) | (475,519) |
Costs of revenue | 216,346 | 178,404 | 432,827 | 344,683 |
Selling, general and administrative expenses | 75,155 | 59,491 | 144,781 | 114,487 |
Interest expense | 4,514 | 1,413 | 8,768 | 3,071 |
Other income (expense), net of tax | 12,461 | 1,187 | 26,085 | 1,812 |
Other comprehensive income (loss), net of tax | (10,747) | (3,380) | (25,273) | (3,486) |
Balance | 359,431 | | 359,431 | |
Investment securities, including noncontrolling interests | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
OCI before reclassifications net of tax | (271) | (23) | (141) | 186 |
Other Comprehensive Income (Loss), Tax | | | | |
OCI before reclassifications, Tax | (2) | (32) | 19 | 84 |
Investment securities, including noncontrolling interests | Other income (expense) | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | (1) | (40) | 21 | 0 |
Investment securities, including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | | | | |
Reclassifications from OCI to: | | | | |
Other income | (181) | (72) | (174) | 18 |
Investment securities, noncontrolling interests | | | | |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (28) | (35) | (21) | 41 |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | (15) | (19) | (11) | 22 |
Accumulated Net Unrealized Investment Gain Loss [Member] | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
Balance | 199 | 280 | 69 | 57 |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (424) | (60) | (294) | 163 |
Balance | (225) | 220 | (225) | 220 |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | 12 | (53) | 51 | 62 |
Currency Translation Adjustments, including noncontrolling interests | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
OCI before reclassifications net of tax | (7,071) | 821 | (17,724) | 4,426 |
Currency Translation Adjustments, noncontrolling interests | | | | |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (230) | (340) | (1,613) | 146 |
Accumulated Translation Adjustment [Member] | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
Balance | (50,477) | (47,296) | (41,207) | (50,415) |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (6,841) | 1,161 | (16,111) | 4,280 |
Balance | (57,318) | (46,135) | (57,318) | (46,135) |
Cash Flow Hedges, including noncontrolling interests | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
OCI before reclassifications net of tax | (4,440) | (22) | (7,946) | (42) |
Other Comprehensive Income (Loss), Tax | | | | |
OCI before reclassifications, Tax | (1,677) | 153 | (3,189) | 403 |
Cash Flow Hedges, including noncontrolling interests | Sales [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 282 | (1,010) | 406 | (1,907) |
Cash Flow Hedges, including noncontrolling interests | Cost Of Sales [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 163 | (594) | 89 | (1,160) |
Cash Flow Hedges, including noncontrolling interests | Selling General And Administrative Expenses [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 85 | (342) | 45 | (661) |
Cash Flow Hedges, including noncontrolling interests | Interest expenses | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | (61) | (14) | (114) | (14) |
Cash Flow Hedges, including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | | | | |
Reclassifications from OCI to: | | | | |
Revenue | 525 | (1,909) | 757 | (3,604) |
Costs of revenue | 496 | (1,393) | 252 | (2,892) |
Selling, general and administrative expenses | 258 | (808) | 128 | (1,649) |
Interest expense | (176) | (21) | (329) | (21) |
Cash Flow Hedges, noncontrolling interests | | | | |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | 11 | (404) | (78) | (693) |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | 6 | (214) | (42) | (367) |
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
Balance | (1,831) | 8,023 | 1,881 | 11,789 |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (3,348) | (3,749) | (7,060) | (7,515) |
Balance | (5,179) | 4,274 | (5,179) | 4,274 |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | (1,214) | (1,593) | (2,721) | (2,972) |
Benefit plans, including noncontrolling interests | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
OCI before reclassifications net of tax | (32) | | (352) | |
Reclassifications from OCI to: | | | | |
Other adjustments | 93 | 6 | 151 | 11 |
Other Comprehensive Income (Loss), Tax | | | | |
OCI before reclassifications, Tax | 29 | 0 | 348 | 0 |
Benefit plans, prior service credit (cost), including noncontrolling interests | Cost Of Sales [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, prior service credit (cost), including noncontrolling interests | Selling General And Administrative Expenses [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, prior service credit (cost), including noncontrolling interests | Other income (expense) | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, prior service credit (cost), including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | | | | |
Reclassifications from OCI to: | | | | |
Costs of revenue | | 2 | | 4 |
Other income (expense), net of tax | 14 | | 28 | |
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Cost Of Sales [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Selling General And Administrative Expenses [Member] | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Other income (expense) | | | | |
Other Comprehensive Income (Loss), Tax | | | | |
Reclassifications from OCI, Tax | 0 | 0 | 0 | 0 |
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Reclassification Out Of Accumulated Other Comprehensive Income [Member] | | | | |
Reclassifications from OCI to: | | | | |
Costs of revenue | | 27 | | 53 |
Selling, general and administrative expenses | | 12 | | 24 |
Other income (expense), net of tax | 38 | | 77 | |
Benefit plans, noncontrolling interests | | | | |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | (8) | | (9) | |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | 0 | 0 | 0 | 0 |
Accumulated Defined Benefit Plans Adjustment [Member] | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | |
Balance | (1,632) | (1,135) | (1,424) | (1,180) |
Reclassifications from OCI to: | | | | |
Other comprehensive income (loss), net of tax | 121 | 47 | (87) | 92 |
Balance | (1,511) | (1,088) | (1,511) | (1,088) |
Other Comprehensive Income (Loss), Tax | | | | |
Comprehensive income (loss), Tax | 0 | 0 | 0 | 0 |
Accumulated Other Comprehensive Income [Member] | | | | |
Reclassifications from OCI to: | | | | |
Balance | $ (64,233) | $ (42,729) | $ (64,233) | $ (42,729) |