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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Jul. 31, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 1,057,084
Balance	$ 1,057,084	1,042,814		$ 1,057,084
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		2,161		1,651,059	$ 2,305,554
Balance	2,161		$ 2,042,763	2,161	2,042,763
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		0
Gains/(losses) recognized in OCI		7
Reclasses from OCI to net income		75
Net period OCI		82
Balance	0	82		0
Available for Sale Securities | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9)	68	(47)	(95)	(208)
Gains/(losses) recognized in OCI	51		79	57	138
Reclasses from OCI to net income	26		40	106	142
Net period OCI	77		119	163	280
Balance	68		72	68	72
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		0
Gains/(losses) recognized in OCI		7
Reclasses from OCI to net income		75
Net period OCI		82
Balance	0	82		0
Accumulated other comprehensive loss | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,258)	(12,779)	(6,634)	(10,344)	(6,866)
Gains/(losses) recognized in OCI	(2,547)		79	(2,541)	138
Reclasses from OCI to net income	26		112	106	285
Net period OCI	(2,521)		191	(2,435)	423
Balance	(12,779)		(6,443)	(12,779)	(6,443)
Currency Translation Adjustment | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,811)	(9,811)	(9,811)	(9,811)	(9,811)
Gains/(losses) recognized in OCI	0		0	0	0
Balance	(9,811)		(9,811)	(9,811)	(9,811)
Pension/Post-retirement Benefits | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(438)	$ (3,036)	4,683	(438)	4,683
Gains/(losses) recognized in OCI	(2,598)		0	(2,598)	0
Net period OCI	(2,598)			(2,598)
Balance	$ (3,036)		4,683	$ (3,036)	4,683
Interest Rate Swaps | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(1,459)		(1,530)
Gains/(losses) recognized in OCI			0		0
Reclasses from OCI to net income			72		143
Net period OCI			72		143
Balance			$ (1,387)		$ (1,387)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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