ACQUISITION OF DNP PHOTOMASK TECHNOLOGY TAIWAN CO., LTD. (Policies)	6 Months Ended
	May 04, 2014
ACQUISITION OF DNP PHOTOMASK TECHNOLOGY TAIWAN CO., LTD. [Abstract]
Business Combinations	The DPTT Acquisition met the conditions of a business combination as defined by Accounting Standards Codification (“ASC”) 805 and, as such, is accounted for under ASC 805 using the purchase method of accounting. ASC 805 defines the three elements of a business as Input, Process and Output. As a result of the DPTT Acquisition, Photronics acquired the machinery and equipment utilized in the processes to manufacture product, the building that houses the entire operation and the processes needed to manufacture the product, all previously owned by DPTT. The former DPTT employees hired by Photronics in connection with the acquisition brought with them the skills, experience and know-how necessary to provide the operational processes that, when applied to the acquired assets, represent processes being applied to inputs to create outputs. Having met all three elements of a business as defined in ASC 805, the Company determined that the DPTT Acquisition should be accounted for as a business acquisition. In addition to recording the fair values of the net assets acquired, the Company also recorded a gain on acquisition of $16.4 million in the condensed consolidated statement of income within other income (expense) in accordance with ASC 805 using the acquisition method of accounting. The gain on acquisition was primarily due to the difference between the market values of the acquired real estate and personal property exceeding the fair value of the consideration transferred. In addition, a deferred tax liability of $3.0 million was recorded in the opening balance sheet, which had the effect of reducing the gain on acquisition to $16.4 million. Prior to recording the gain, the Company reassessed whether it had correctly identified all of the assets acquired and all of the liabilities assumed. Additionally, the Company also reviewed the procedures used to measure the amounts of the identifiable assets acquired, liabilities assumed and consideration transferred. The acquisition date fair value of the property, plant and equipment of DPTT was $95.4 million, which was determined by utilizing the cost and, to a lesser extent, the market approach, based on an in-use premise of value. This fair value measurement is based on significant inputs that are not observable in the market and thus represents a fair value measurement categorized within Level 3 of the fair value hierarchy. Key assumptions include local and current construction replacement cost multipliers, amounts of ancillary replacement costs, physical deterioration, and economic and functional obsolescence to adjust the current replacement costs by, as well as the estimated economic lives of the assets. Identifiable intangible assets acquired were primarily customer relationships, which represent the fair value of relationships and agreements DPTT had in place at the date of the merger, and had a fair value of $1.5 million at the acquisition date determined by using the multi-period excess earnings method and a twelve year estimated amortization period. The acquisition date fair value of the remainder of the identifiable assets acquired and liabilities assumed were equivalent to, or did not materially differ from their carrying values.

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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