Accumulated Other Comprehensive Loss (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | $ 399,202,000 | $ 390,774,000 | $ 421,347,000 | $ 436,083,000 | $ 390,774,000 | $ 436,083,000 |
Reclassifications from OCI to: | | | | | | |
Other income | (564,000) | | (819,000) | | (928,000) | (1,443,000) |
Revenue | (328,501,000) | | (305,520,000) | | (647,525,000) | (605,551,000) |
Costs of revenue | 238,584,000 | | 216,346,000 | | 473,319,000 | 432,827,000 |
Selling, general and administrative expenses | 70,682,000 | | 75,155,000 | | 141,543,000 | 144,781,000 |
Interest expense | 4,835,000 | | 4,514,000 | | 9,743,000 | 8,768,000 |
Less: comprehensive income (loss) attributable to noncontrolling interest, net of tax | 35,000 | | 200,000 | | 365,000 | (535,000) |
Other comprehensive income (loss) | (8,585,000) | (1,194,000) | | (14,526,000) | | |
Other income (expense), net of tax | 7,157,000 | | 12,461,000 | | 9,826,000 | 26,085,000 |
Comprehensive income (loss) | | | (10,492,000) | | | |
Balance | 397,397,000 | 399,202,000 | 359,431,000 | 421,347,000 | 397,397,000 | 359,431,000 |
Investment securities, including noncontrolling interests | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
OCI before reclassifications net of tax | (3,000) | | (271,000) | | (2,000) | (141,000) |
Other Comprehensive Income (Loss), Tax | | | | | | |
OCI before reclassifications, Tax | 0 | | (2,000) | | 0 | 19,000 |
Investment securities, including noncontrolling interests | Other income (expense) | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | 0 | | (1,000) | | 0 | 21,000 |
Investment securities, including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income | | | | | | |
Reclassifications from OCI to: | | | | | | |
Other income | | | (181,000) | | 2,000 | (174,000) |
Investment securities, noncontrolling interests | | | | | | |
Reclassifications from OCI to: | | | | | | |
Less : Noncontrolling interests, net of tax | | | 28,000 | | | 21,000 |
Other Comprehensive Income (Loss), Tax | | | | | | |
Noncontrolling interests, Tax | 0 | | 15,000 | | 0 | 11 |
Accumulated Net Unrealized Investment Gain Loss | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | 15,000 | 12,000 | 199,000 | 69,000 | 12,000 | 69,000 |
Reclassifications from OCI to: | | | | | | |
Comprehensive income (loss) | (3,000) | | (424,000) | | | (294,000) |
Balance | 12,000 | 15,000 | (225,000) | 199,000 | 12,000 | (225,000) |
Other Comprehensive Income (Loss), Tax | | | | | | |
Comprehensive income (loss), Tax | 0 | | 12,000 | | 0 | 51,000 |
Currency Translation Adjustments, including noncontrolling interests | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
OCI before reclassifications net of tax | (6,355,000) | | (7,071,000) | | (6,736,000) | (17,724,000) |
Reclassifications from OCI to: | | | | | | |
Less : Noncontrolling interests, net of tax | 111,000 | | 230,000 | | (26,000) | 1,613,000 |
Accumulated Translation Adjustment [Member] | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | (57,872,000) | (57,354,000) | (50,477,000) | (41,207,000) | (57,354,000) | (41,207,000) |
Reclassifications from OCI to: | | | | | | |
Comprehensive income (loss) | (6,244,000) | | (6,841,000) | | (6,762,000) | (16,111,000) |
Balance | (64,116,000) | (57,872,000) | (57,318,000) | (50,477,000) | (64,116,000) | (57,318,000) |
Cash Flow Hedges, including noncontrolling interests | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
OCI before reclassifications net of tax | (46,000) | | (4,440,000) | | (247,000) | (7,946,000) |
Other Comprehensive Income (Loss), Tax | | | | | | |
OCI before reclassifications, Tax | (73,000) | | (1,677,000) | | (283,000) | (3,189,000) |
Cash Flow Hedges, including noncontrolling interests | Revenue | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | 0 | | 282,000 | | 7,000 | 406,000 |
Cash Flow Hedges, including noncontrolling interests | Costs of revenue | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | (240,000) | | 163,000 | | (316,000) | 89,000 |
Cash Flow Hedges, including noncontrolling interests | Selling General And Administrative Expenses | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | (104,000) | | 85,000 | | (141,000) | 45,000 |
Cash Flow Hedges, including noncontrolling interests | Interest expenses | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | (26,000) | | (61,000) | | (81,000) | (114,000) |
Cash Flow Hedges, including noncontrolling interests | Reclassification Out Of Accumulated Other Comprehensive Income | | | | | | |
Reclassifications from OCI to: | | | | | | |
Revenue | | | 525,000 | | 11,000 | 757,000 |
Costs of revenue | (879,000) | | 496,000 | | (1,208,000) | 252,000 |
Selling, general and administrative expenses | (379,000) | | 258,000 | | (541,000) | 128,000 |
Interest expense | (75,000) | | (176,000) | | (228,000) | (329,000) |
Cash Flow Hedges, noncontrolling interests | | | | | | |
Reclassifications from OCI to: | | | | | | |
Less : Noncontrolling interests, net of tax | | | (11,000) | | (1,000) | 78,000 |
Other Comprehensive Income (Loss), Tax | | | | | | |
Noncontrolling interests, Tax | 0 | | (6,000) | | 0 | 42,000 |
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | (796,000) | 39,000 | (1,831,000) | 1,881,000 | 39,000 | 1,881,000 |
Reclassifications from OCI to: | | | | | | |
Comprehensive income (loss) | (1,379,000) | | (3,348,000) | | (2,214,000) | (7,060,000) |
Balance | (2,175,000) | (796,000) | (5,179,000) | (1,831,000) | (2,175,000) | (5,179,000) |
Other Comprehensive Income (Loss), Tax | | | | | | |
Comprehensive income (loss), Tax | (443,000) | | (1,214,000) | | (814,000) | (2,721,000) |
Benefit plans, including noncontrolling interests | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
OCI before reclassifications net of tax | (1,034,000) | | (32,000) | | (911,000) | (352,000) |
Reclassifications from OCI to: | | | | | | |
Other adjustments | 75,000 | | 93,000 | | 72,000 | 151,000 |
Other Comprehensive Income (Loss), Tax | | | | | | |
OCI before reclassifications, Tax | 0 | | 29,000 | | 0 | 348,000 |
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 | | | | | | |
Reclassifications from OCI to: | | | | | | |
Other income (expense), net of tax | 7,000 | | 14,000 | | 13,000 | 28,000 |
Benefit plans, net actuarial gain (loss), including noncontrolling interest | Reclassification Out Of Accumulated Other Comprehensive Income | | | | | | |
Reclassifications from OCI to: | | | | | | |
Other income (expense), net of tax | 104,000 | | 38,000 | | 140,000 | 77,000 |
Benefit plans, noncontrolling interests | | | | | | |
Reclassifications from OCI to: | | | | | | |
Less : Noncontrolling interests, net of tax | | | 8,000 | | (6,000) | 9,000 |
Other Comprehensive Income (Loss), Tax | | | | | | |
Noncontrolling interests, Tax | 0 | | 0 | | 0 | 0 |
Accumulated Defined Benefit Plans Adjustment | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | (1,928,000) | (2,084,000) | (1,632,000) | (1,424,000) | (2,084,000) | (1,424,000) |
Reclassifications from OCI to: | | | | | | |
Comprehensive income (loss) | (848,000) | | 121,000 | | (692,000) | (87,000) |
Balance | (2,776,000) | (1,928,000) | (1,511,000) | (1,632,000) | (2,776,000) | (1,511,000) |
Other Comprehensive Income (Loss), Tax | | | | | | |
Comprehensive income (loss), Tax | 0 | | 29,000 | | 0 | 348,000 |
Benefit plans, net actuarial gain (loss) | Other income (expense) | | | | | | |
Other Comprehensive Income (Loss), Tax | | | | | | |
Reclassifications from OCI, Tax | 0 | | 0 | | 0 | 0 |
Accumulated Other Comprehensive Income | | | | | | |
Changes in the components of accumulated other comprehensive income (loss) | | | | | | |
Balance | (60,581,000) | (59,387,000) | (53,741,000) | (40,681,000) | (59,387,000) | (40,681,000) |
Reclassifications from OCI to: | | | | | | |
Other comprehensive income (loss) | | | | (13,060,000) | | |
Comprehensive income (loss) | (8,474,000) | (1,194,000) | (10,492,000) | | | |
Balance | $ (69,055,000) | $ (60,581,000) | $ (64,233,000) | $ (53,741,000) | $ (69,055,000) | $ (64,233,000) |