Income Taxes - Additional Information (Detail) - USD ($)		6 Months Ended
	Dec. 29, 2014	Jan. 31, 2017	Jul. 31, 2016
Income Taxes [Line Items]
Unrecognized tax benefits related to federal, state and foreign taxes		$ 700,000	$ 1,200,000
Expected any unrecognized tax benefits to reverse in the next twelve months		$ 0
Stockholder owning ownership on corporation's securities percentage		5.00%
Stockholder owning ownership on corporation's securities rolling period		3 years
Tax Benefit Preservation Plan
Income Taxes [Line Items]
Tax Benefit Preservation Plan, adoption date		Oct. 17, 2011
Minimum | Tax Benefit Preservation Plan
Income Taxes [Line Items]
Percentage of ownership require to obtain approval from board of directors to acquiring shares of the company's securities		4.99%
Maximum | Handy & Harman | Tax Benefit Preservation Plan
Income Taxes [Line Items]
Percentage of common shares outstanding permitted for acquired by HNH and its affiliates	45.00%