Discontinued Operations - Additional Information (Detail) € in Thousands, $ in Thousands, £ in Millions						11 Months Ended	12 Months Ended
	Sep. 30, 2016 GBP (£)	Jun. 06, 2016 EUR (€)	May 04, 2016 GBP (£)	Jul. 20, 2015 USD ($)	Jun. 05, 2015 USD ($)	Oct. 02, 2015 USD ($)	Sep. 30, 2016 USD ($)	Oct. 02, 2015 USD ($)		Sep. 30, 2015 USD ($)	Oct. 31, 2014 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Loss on net assets held for sale						$ 31,154	$ 8,448	$ 30,792	[1]	$ 30,792	$ 49,472
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation						1,600	800	1,600
Discontinued Operations Previously Sold Business Unit
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Environmental remediation expense						2,100	800				800
Environmental Exit Costs, Assets Previously Disposed, Liability for Remediation						1,600	800	$ 1,600
Remediation costs						$ 2,000	$ 1,500				$ 700
Eclipse
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of discontinued operation					$ 7,900
PA&E
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of discontinued operation				$ 22,300
Wallop
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Sale of discontinued operation		€ 1,250	£ 2.5
Deferred compensation payments		€ 1,250	£ 9.0
Deferred compensation payment date		Oct. 31, 2019	May 03, 2019
Deferred compensation payable acceptable orders percentage		10.00%
Payments for earn out | £	£ 5.8
Wallop | Minimum
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred compensation payable acceptable orders percentage			26.50%
Wallop | Maximum
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred compensation payable acceptable orders percentage			31.00%

[1] (Recast)