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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
US tax on deemed repatriated foreign earnings |  | $ 59,114,000 | $ 57,138,000 | $ 0 | $ 0
Transition tax related to repatriation of foreign earnings payable in next twelve months | $ 4,571,000 |  | 4,571,000 |  |
Re-measurement of deferred taxes |  |  | 14,395,000 | 0 | 0
Intercompany dividends |  |  | 250,000,000 | 13,692,000 | 0
Adjustments to transition tax for accumulated foreign earnings | (3,887,000) |  |  |  |
Adjustments to deferred taxes due to change in tax rate | 973,000 |  |  |  |
Foreign income before taxes |  |  | 149,214,000 | 63,011,000 | 105,938,000
Expected future taxable income to fully realize the deferred tax assets |  |  | 118,118,000 |  |
Change in net deferred tax assets attributable to other comprehensive income |  |  | 253,000 |  |
Domestic taxable income |  |  | 321,482,000 | (56,305,000) | 50,947,000
Valuation allowance | 0 |  | 0 | 0 |
Unremitted earnings of non-US subsidiaries | 385,884,000 | 627,787,000 | 385,884,000 |  |
Distribution from foreign subsidiary | 250,000,000 |  |  |  |
Provision for income tax |  |  | 106,302,000 | (12,696,000) | 34,620,000
Non US subsidiary cash and cash equivalents | 203,032,000 |  | 203,032,000 |  |
Unremitted earnings of non-US subsidiaries not subject to transition tax | 15,389,000 |  | 15,389,000 |  |
Unrecognized tax benefits | 9,594,000 |  | 9,594,000 | 11,727,000 | 8,695,000
Unrecognized tax benefits and associated interest and penalties | 3,224,000 |  | 3,224,000 | 2,990,000 |
Unrecognized tax benefits |  |  | 1,301,000 | $ 2,691,000 | $ 3,670,000
Unrecognized tax benefits income tax penalties and interest Expense |  |  | 369,000 |  |
Unrecognized tax benefit expected to settle in next twelve months | 0 |  | 0 |  |
US Federal Tax Authority |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
US tax on deemed repatriated foreign earnings |  |  | 57,138,000 |  |
State Tax Authority |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
US tax on deemed repatriated foreign earnings |  |  | 1,976,000 |  |
Transition tax on dividend remitted from foreign subsidiary |  |  | 607,000 |  |
Adjustments to transition tax for accumulated foreign earnings | 1,558,000 |  |  |  |
State transition tax expense on foreign earnings |  | $ 927,000 |  |  |
Provision for income tax | 607,000 |  |  |  |
Periods Before Fiscal Year 2018 |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
US tax on deemed repatriated foreign earnings |  |  | $ 44,871,000 |  |
Adjustments to transition tax for accumulated foreign earnings | (7,570,000) |  |  |  |
2018 |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Adjustments to transition tax for accumulated foreign earnings | $ 3,683,000 |  |  |  |

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- Definition The change during the period in the tax effect of the amount of the estimated future tax deductions arising from unrealized losses on items in other comprehensive income which can only be deducted for tax purposes when the losses are realized, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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