Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation CSS Industries, Inc. (collectively with its subsidiaries, “CSS” or the “Company”) has prepared the consolidated financial statements included herein pursuant to the rules and regulations of the Securities and Exchange Commission. The Company has condensed or omitted certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States pursuant to such rules and regulations. In the opinion of management, the statements include all adjustments (which include normal recurring adjustments) required for a fair presentation of financial position, results of operations and cash flows for the interim periods presented. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2016. The results of operations for the interim periods are not necessarily indicative of the results for the full year. The Company’s fiscal year ends on March 31. References to a particular fiscal year refer to the fiscal year ending in March of that year. For example, “fiscal 2017” refers to the fiscal year ending March 31, 2017.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation.
Nature of Business	Nature of Business CSS is a consumer products company primarily engaged in the design, manufacture, procurement, distribution and sale of all occasion and seasonal social expression products, principally to mass market retailers. These all occasion and seasonal products include decorative ribbons and bows, classroom exchange Valentines, infant products, journals, buttons, boxed greeting cards, gift tags, gift card holders, gift bags, gift wrap, decorations, floral accessories, craft and educational products, Easter egg dyes and novelties, memory books, scrapbooks, stickers, stationery, and other items that commemorate life’s celebrations. The seasonal nature of CSS’ business has historically resulted in lower sales levels and operating losses in the first and fourth quarters and comparatively higher sales levels and operating profits in the second and third quarters of the Company’s fiscal year, which ends March 31, thereby causing significant fluctuations in the quarterly results of operations of the Company. The Company's principal operating subsidiaries include Berwick Offray LLC ("Berwick Offray"), Paper Magic Group, Inc. ("Paper Magic") and C.R. Gibson, LLC ("C.R. Gibson").
Reclassification	Reclassification Certain prior period amounts have been reclassified to conform with the current year classification.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions Translation adjustments are charged or credited to a separate component of stockholders’ equity. Gains and losses on foreign currency transactions are not material and are included in other income, net in the consolidated statements of operations.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Judgments and assessments of uncertainties are required in applying the Company’s accounting policies in many areas. Such estimates pertain to revenue recognition, the valuation of inventory and accounts receivable, the assessment of the recoverability of goodwill and other intangible and long-lived assets, income tax accounting, the valuation of share-based awards and resolution of litigation and other proceedings. Actual results could differ from these estimates.
Short-Term Investments	Short-Term Investments The Company categorizes and accounts for its short-term investment holdings as held-to-maturity securities. Held-to-maturity securities are recorded at amortized cost which approximates fair value at June 30, 2016, March 31, 2016 and June 30, 2015. This categorization is based upon the Company's positive intent and ability to hold these securities until maturity.
Inventories	Inventories The Company records inventory when title is transferred, which occurs upon receipt or prior to receipt dependent on supplier shipping terms. The Company adjusts unsaleable and slow-moving inventory to its estimated net realizable value. Substantially all of the Company’s inventories are stated at the lower of first-in, first-out (FIFO) cost or market. The remaining portion of the inventory is valued at the lower of last-in, first-out (LIFO) cost or market.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are stated at cost
Long-Lived Assets including Goodwill and Other Intangible Assets	Long-Lived Assets including Goodwill and Other Intangible Assets The Company performs an annual impairment test of the carrying amount of goodwill and indefinite-lived intangible assets in the fourth quarter of its fiscal year. Additionally, the Company would perform its impairment testing at an interim date if events or circumstances indicate that goodwill or intangibles might be impaired. During the three months ended June 30, 2016, there were no such events or circumstances. The Company uses a dual approach to determine the fair value of its reporting units, including both a market approach and an income approach. The Company believes the use of multiple valuation techniques results in a more accurate indicator of the fair value of each reporting unit. The first step of the test compares the fair value of a reporting unit to its carrying amount, including goodwill, as of the date of the test. If the carrying amount of the reporting unit exceeds its fair value, the second step is performed. The second step compares the carrying amount of the goodwill to the implied fair value of the goodwill. If the implied fair value of the goodwill is less than the carrying amount of the goodwill, an impairment loss would be reported. Other indefinite-lived intangible assets consist primarily of tradenames, which are also required to be tested annually for impairment. The fair value of the Company’s tradenames is calculated using a “relief from royalty payments” methodology. Long-lived assets (including property, plant and equipment), except for goodwill and indefinite-lived intangible assets, are reviewed for impairment when events or circumstances indicate the carrying value of an asset group may not be recoverable. If such asset group is considered to be impaired, the impairment to be recognized is the amount by which the carrying amount of the asset group exceeds the fair value of the asset group.
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences and carryforwards are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company records a valuation allowance to reduce deferred tax assets to the amount that is more likely than not to be realized. The Company recognizes the impact of an uncertain tax position if it is more likely than not that such position will be sustained on audit, based solely on the technical merits of the position.
Revenue Recognition	Revenue Recognition The Company recognizes revenue from product sales when the goods are shipped, title and risk of loss have been transferred to the customer and collection is reasonably assured. Provisions for returns, allowances, rebates to customers and other adjustments are provided in the same period that the related sales are recorded.
Net Loss Per Common Share	Net Loss Per Common Share Due to the Company's net losses in the first quarter, potentially dilutive securities of 570,000 shares and 265,000 shares as of June 30, 2016 and 2015, respectively, consisting of outstanding stock options and unearned restricted stock units, were excluded from the diluted net loss per common share calculation due to their antidilutive effect.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In March 2016, the FASB issued Accounting Standards Update ("ASU") 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). ASU 2016-09 simplifies several aspects of accounting for share-based payment award transactions, including income tax consequences, classification of awards as either liability or equity, and classification on the statement of cash flows. The standard is effective for annual periods beginning after December 15, 2016, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact the adoption of ASU 2016-09 will have on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). ASU 2016-02 requires lessees to record a right-of-use asset and lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative periods presented in the financial statements, with certain practical expedients available. The standard also requires certain quantitative and qualitative disclosures. The Company is currently evaluating the effect that ASU 2016-02 will have on its consolidated financial statements and related disclosures. In November 2015, the FASB issued ASU 2015-17, "Balance Sheet Classification of Deferred Taxes" ("ASU 2015-17"), which requires entities to present all deferred tax liabilities and assets as noncurrent on the balance sheet instead of separating deferred taxes into current and noncurrent amounts. The Company adopted ASU 2015-17 on a retrospective basis in the fourth quarter of fiscal 2016. The adoption of ASU 2015-17 resulted in a $4,430,000 reduction in current deferred tax assets and a $4,430,000 increase in noncurrent deferred tax assets as of June 30, 2015. In September 2015, the FASB issued ASU 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments" ("ASU 2015-16"). ASU 2015-16 eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. This guidance was effective for the Company beginning April 1, 2016 and will be applied prospectively to adjustments arising after that date. There was no impact of adopting this standard in the current period. In July 2015, the FASB issued ASU 2015-11, "Simplifying the Measurement of Inventory" ("ASU 2015-11"). ASU 2015-11 amends the guidelines for the measurement of inventory from lower of cost or market to the lower of cost and net realizable value (NRV). NRV is defined as the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal, and transportation. Under existing standards, inventory is measured at lower of cost or market, which requires the consideration of replacement cost, NRV and NRV less an amount that approximates a normal profit margin. This ASU eliminates the requirement to determine and consider replacement cost or NRV less a normal profit margin for inventory measurement. The new standard is effective prospectively for fiscal years beginning after December 15, 2016, with early adoption permitted. The Company is currently evaluating the effect that ASU 2015-11 will have on its consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"). ASU 2014-09 provides a single model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. The new standard also requires expanded disclosures regarding the qualitative and quantitative information about the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period. Early application is permitted for fiscal years beginning after December 15, 2016. The standard permits the use of either a full retrospective or a modified retrospective approach. The Company is evaluating the method by which it will adopt ASU 2014-09 and the impact it will have on its consolidated financial statements and related disclosures.