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Business and summary of significant accounting policies - Effect of Topic 606 to Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
--- | --- | --- | ---
ASSETS |  |  |
Accounts receivable — unbilled | $ 123,884 | $ 66,950 | $ 31,536
Deferred income taxes | 186 | 209 | 6,834
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred revenue - current | 43,344 | 39,415 | 51,182
Deferred income taxes - long-term | 46,560 | 33,451 | 26,377
Common stock | 498,433 |  | 487,539
Accumulated other comprehensive loss | (45,380) |  | (36,953)
Retained earnings | 794,739 | 666,210 | 633,281
Noncontrolling interests | 409 | 3,105 | $ 2,552
Balance under previous accounting guidance |  |  |
ASSETS |  |  |
Accounts receivable — unbilled | 88,390 |  |
Deferred income taxes | 8,065 |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred revenue - current | 54,834 |  |
Deferred income taxes - long-term | 41,055 |  |
Common stock | 497,232 |  |
Accumulated other comprehensive loss | (43,018) |  |
Retained earnings | 759,978 |  |
Accounting Standards Update 2014-09 |  |  |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Retained earnings |  | 32,900 |
Accounting Standards Update 2014-09 | Adjustments due to adoption of new standard |  |  |
ASSETS |  |  |
Accounts receivable — unbilled | 35,494 | 35,414 |
Deferred income taxes | (7,879) | (6,625) |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred revenue - current | (11,490) | (11,767) |
Deferred income taxes - long-term | 5,505 | 7,074 |
Common stock | 1,201 |  |
Accumulated other comprehensive loss | (2,362) |  |
Retained earnings | $ 34,761 | 32,929 |
Noncontrolling interests |  | $ 553 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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